Which only proves, that White should play 3.e4, as I have mentioned in my first post. Or 2...Nf6 3.d3, see also above.
So I am looking forward to your recommendation after these White options.

I don't like the queen's fianchetto in the Dutch very much - here I disagree with all experts. So nobody will be amazed that I will not recommend 1.f4 c5 2.Nf3 Nf6 3.b3 either. White has done badly in practice.
Most flexible is 1.f4 c5 2.Nf3 Nf6 (this is a light concession - if play transposes to the Closed Sicilian, Black cannot play the important setups with Nge7 anymore) 3.d3 "threatens" 4.e4. Black either has to play 3...d5, after which White still can chose between the Classical 4.e3 and the Bird Leningrad 4.g3, or something else.
After both 3.d3 g6 and 3.d3 Nc6 White will play 4.e4 of course. He still has the choice of developing the bishop to e2 or to g2. The latter, like Black Widow wrote in his first post, is likely to transpose to the Closed Sicilian. White has avoided the setups with e6/Nge7 and e5/Nge7, which are considered best for Black. If White choses to play Be2, than he might take some benefit of having the move c2-c3 available.
3.d3 e6 4.e4 leads to a position of the GPA, that has been played by a few strong players.

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What if Black plays Nf6 sooner? E.g. 1.f4 Nf6 2.Nf3 c5. Then White needs to place either a Knight on c3 or the d-pawn at d3 in order to play e4.

If you do not mind to play the Leningrad Bird, then you can also play the closed sicilian, with a nice extra option. Since the Night on b1 can be hold back for some time, for example:

1. f4 c5 2. Nf3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e4 e6 6. d3 Nge7 7. O-O d6 8. c3!? This is a comfortable line for white, known as the Big Clamp. Many Black players will play this, since they hope for Nc3, so they are back in well known theory.

If Black plays the Night to f6, then I still would prefer the White Night on c3.