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I admire you not only for taking on the GM, but for upholding your views about this gambit so publicly; views that I believe to be mistaken, of course.

Do you have the time and energy also to fight against 5...Bf5  6. Ne5 e6 right now?  I would give you a game in that line if you would like.  I'm 2240 (USCF) OTB; my USCF CC-rating is 2450; my ICCF CC-rating has been that high, but it is down around 2270 right now.

Or perhaps we could play some other time if your load here is already enough.

This is not the point MNB. I know some 2100 OTB players who are 2600 GM by correspondance...

With the Lemberger, Black only wants to demonstrate comfortable equality, eg with prospects of outplaying the opponent and eventually win.
Of course, White argues he can prove the opposite !

This is a practical approach when accepting the pawn, I agree, could be better -By the way, this is what you and Bonsai are trying to demonstrate- but that means giving the BDG player what he seeks and believes in.

I found no game in my 4M° base, including the Chessbase correspondance games, with Patrik's 7.Bc4.
So I want clear things out with this 4.Nge2 line. (since it is very difficult to take 4.Nxe4 exd4 or 4...Qxd4 5.Bd3 Nc6 seriously) and publish the game in the section.

May the BDG fan not despair, I am also ready to do the same with the accepted version provided that it matches the sequence 1.d4 d5 2.Bg5 f6 3.Bf4 only move 3...e5!? 4.dxe5

I say that to say that I think white is fine in this variation, after Qd2, it is whites only move, I looked into f3 but was not happy with the results.

Hmm.   I wasn't sure what Black was up to in this line, which has a sort of Staunton-Gambitish feel to it, but now I think I see it. 

8. Qd2 c6!  9. dxc6 Nxc6  10. h3 (10. Qxd8 Rxd8 and Black has great activity, e.g. 11. O-O Nd4; similarly 10. O-O Nd4)  and now:

(I) 10...Qd4!?

(I-a) 11. Nb5 Qxc4  12. hxg4 Nd4! (12...Rd8??  13. Nf5++) and Black is much better.

(I-b)  11. Bxf7+ Kxf7  12. hxg4 e3!  13. Qxe3 Nb4 also favors Black.

(I-c)  11. Bb3! and White has good hope of the half point, it seems to me (though Black can try 11...Be6!?).

(II)  10...Bd7! (sez I)  11. Ngxe4 Nxe4  12. Nxe4 Bf5 and Black is slightly better with his more active pieces.

Hello Patrik, I am ready to take up the gauntlet on the Lemberger 1.d4 d5 2.e4 dxe4 3.Nc3 e5.

Strangely enough, I see no simple ways of giving back the pawn in return for comfortable equalization after   4.Ne2 and a closer look.

So I have to enter some complications 4...Nc6 5.d5 Nge7 6.Ng3 Nf6 7.Bc4 definitely better than 7.Bg5 as analysed previously in my update.

7...c6 'stinks' and I trust your analysis.
Therefore I want to try 7...Bg4.
It is your move.