Thx for all your suggestions!
As I gradually want to get away from the Leningrad I don't think I would like the lines that are similar to a closed sicilian.
The reversed sicilian lines after 1.c4 e5 2.Nc3 Nf6 3.g3 d5/ 3.Nf3 Nc6 4.g3 d5 look interesting, but as a dragon player I consider the classical dragon harmless and I'm not so sure if black has a good plan with chances to equalize.
Does anybody have some exprerience with the lines like 1.c4 e5 2.Nc3 Nf6 3.g3 d5 4.cd5: Nd5: 5.Bg2 Nb6 6.Nf3 Nc6 7.0-0 Be7 8.d3 0-0 9.a3 Re8 followed by Bf8 ? That looks like the most interesting try for black to me.
From all the suggestions, I like MNBs lines with c5,g6,Bg7,Nc6 and e6 best. e6 is probably more solid and less committal than e5, but still gives black chances for counterplay. I will try that in some online games.
Another interesting idea I have come across is 1.c4 c5 2.Nc3 g6 3.g3 Bg7 4.Bg2 Nc6 and now d6, Qd7, Bc3:  followed by b6, Bb7 and 0-0-0 from black (almost regardless what white plays). This could be a positional way to unbalance the position and to create winning chances against a weaker player.

@Bonsai and anyone interested in 1.c4 g5:
I will post my thoughts on 1.c4 g5 2.d4 Bg7 3.Nc3 c5 4.d5 h6 5.e4 Bc3: in the Myers' Opening thread.

"Lately I tried to play 1.c4 c5 in internet blitz, but the variations I have troubles with is when white doesn't touch his d-pawn and plays 1.c4 c5 2.g3 g6 3.Nc3 Bg7 4.Bg2 Nc6 and now either 5.Nf3, e4, a3,...
I played a setup with e5, Nge7, d6 but my results were clearly worse than with Myers Opening (1.c4 g5)  "

1...c5 is the move I least like to face when playing the english. If the Sicilian is your choice against 1.e4 I would go for 1...c5 vs. the english as well. Notice that many strong players has 1...c5 in their repertoire, it is interesting to see how they handle it. Vs. for instance 5.a3 and 5.Nf3 they often maintain symmetry for a long time, breaking it just when they seem fit. A not uncommon line is something like 1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. a3 a6 6. Rb1 Rb8 7. b4 cxb4 8. axb4 b5 9. cxb5 axb5 10. Nf3 Nf6 11. O-O O-O 12. d4 d5   In my opinion it is in this position not so easy for white to prove any advantage at all. Check the database.

Tony Kosten wrote a nice book on the english called "The dynamic english" but in my opinion had problems finding decent continuations for white in several of these 1...c5-lines.

With 5.e4 white can dodge the whole issue and go for a botvinnik-setup,
but the big weakness with respect to "normal" Botvinnik-positions is that black has not played ...e5, so that the black g7-bishop is controlling the long diagonal and the square d4.

A reversed Botvinnik-setup for black is also a very good option. I analysed this with a friend of mine and discovered that white had to be careful with his moves: 1. c4 c5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Nf3 d6 6. O-O e5 7. a3 a5 8. d3 Nge7 9. Bg5 f6 10. Be3 O-O 11. Ne1 Now Black can play to advance his kingside pawns to get an attack. Personally I find this quite unpleasant. After 11...f5 white`s best is to go back with Bg5, but black can try 11...h6 first to get going.

Hope this is some food for thought..

FightingDragon plays the Benkö and the Accelerated Dragon: that should be the starting point. So transpositions to the Chigorin and the Closed Sicilians with colours reversed do not make much sense imo.
Here are my suggestions: stick to 1.c4 c5 2.Nc3 and now g6 (avoids the nasty Nc6 3.Nf3 g6 4.e3 Bg7 5.d4)
A) 3.e3 Bg7 4.d4 Nf6 5.Nf3 (5.d5 is a nice sort of Benoni - nice for Black) o-o 6.Be2 cxd4 7.exd4 d5 8.cxd5 Nxd5 is a nice version of the Panov Variation with g6.
B) 3.g3 Bg7 4.Bg2 Nc6 followed by e6 and Nge7 might suit FD better than d6, e5 and Nge7. But it is hard to get winning chances after 5.e3 e6 6.Nge2 Nge7 7.o-o o-o, so here you might prefer a different setup.
C) 3.Nf3 Bg7 4.d4 cxd4 5.Nxd4 Nc6 won't bother FD.
D) 3.d4 cxd4 4.Qxd4 Nf6 is very similar to the Accelerated Dragon.

FD might also be interested in 1.c4 c5 2.Nc3 (2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e5, g6 or Nc6) Nf6 3.Nf3 d5 or 3.g3 d5!? The latter might have the objection for FD, that he has to face the Accelerated Dragon with colours reversed.

Of course 1.Nf3 is not a problem: c5 2.g3 (2.c4 or 2.e4  ) Nc6 3.Bg2 g6 4.o-o Bg7 followed by e6 and Nge7 will transpose to either the English or the Closed Sicilian.

Objectively 1...c5 is in my opinion (having played both 1.c4 and 1.Nf3 myself) a very solid move (particularly if Sicilian transpositions don't worry you), however one doesn't always get the most exciting positions.

1.c4 g5 is in my opinion much better than 1.Nf3 h6, because in a lot of the resulting positions the move c2-c4 turns out to be negative for white (e.g. in a variation like 1.c4 g5 2.d4 h6 3.Nc3 Bg7 4.e4 c5 5.d5 Bxc3+, which I find is not bad for black at all), while 1.Nf3 is in a way more "natural" and doesn't impede any of the other white pieces. So I suppose I would argue that g5 systems are not a good universal answer to both 1.c4 and 1.Nf3.

I suppose Bladez does have a point about 1.c4 e5, where the resulting positions can end up being similar to a Leningrad. However once more 1.Nf3 is a bit more difficult in this case, because 1...f5 is currently under a bit of a cloud due to 2.d3, for 1...d6 you have to be willing to play the Pirc after 2.e4 and after 1...g6 a Modern after 2.e4.

But what about 1.Nf3 d5? If white plays queen's gambit style you can get a Chigorin and the other main worry I see is finding a good system against the Reti / Neo-Grünfeld like variations.

How about the systems with g6/d6/e5/f5?

There are many move orders, but for example,

1. c4 g6 2. Nc3 Bg7 3. g3 e5 4. Bg2 d6 5. d3 f5

seems to fit with your Dragon/Dutch background, has scored well for Black, and has been played by Gazza!

I like d6/e5/f5 without a fianchetto too.