"Darcy was so confident Eliz would accept him because he did not think any woman in her position would refuse him, he thought she would be influenced by his money but did not really mind that because he was infatuated and passionately desired her."
I do really think that, if we cannot expect strong expressions of desire in Jane Austen (though there are some), all the left, if true, would be expressed positively or negatively.
In particular, if Darcy could have believed Elizabeth to have pure money views, it would have been said. Of course the book is not finished yet, even if we can go to chapter 48 or 49, but I do think that if such could be the case, there would be at least a hint in his letter.
I grant you that this doesn't necessarily imply that he believes her to be as much in love with him as he was with her, particularly if we remember (and he does seem to remember every word of every conversation) her "in a prudential light, it is certainly a very good match for her". Which meant not her approving a marriage for money, if we read what she had said just before, but seems to show her as a person who could consider a perspective of marriage with a rational sight, rather than pure emotion; just what he did himself, with one exception : his love to Elizabeth. But his mind (with a bit of vanity) tells him they fit perfectly in all points of views, and he believes he has prepared her to be addressed (otherwise I suppose he would not expect her to raise any expectation of such a grand man), and she did not seem ro refuse... We know that it was because she had not understood his hints, but he doesn't know and I do believe these hints were quite clear so though mistaken, he was not so wrong.
I do not think either that he would have proposed a woman he would have believed mercenary. Such an idea, from a man with so deep principles, would have alienated her definitely.
""proud and repulsive as were his manners,"
"She still found him proud and repulsive,"
We don't read this quote alike : she still found his manners proud and repulsive, not himself.
And in your quote of chapter 37, our difference of reading is even stronger. I read, I find plainly written, that she did not want to see him anymore, because she felt "vexation and regret" in "her own past behaviour", and in "her family", "a subject of yet heavier chagrin". That is, it is her own feeling guilty towards him (though one is not guilty of one's own family...) that grieved her, not any dislike of him. Maybe this never happened to you, to wish to never see anymore somebody you like (here, she doesn't like him yet, I venture she could, would not be those awkward feelings) just because you have offended them, or believe so. If such is the case, I understand your reaction, but allow me to assert that it is well what the narrator tells us here, without any doubt.
"If Eliz had been fighting her attraction to him, surely the narrator would have said something like "but she told herself that she did not repent ... ""
No, really. First, there are several examples of the narrator writing a character's mistaken belief s an assertion. But even if the narrator does mean that Elizabeth really did not repent (and I confess I don't know which is the right meaning), why should it mean that she had not checked her attraction since the beginning? She had done so quickly, strongly and steadily! So strongly and steadily, that it is what enlightens us, readers, about this attraction, of which we have already debated repeatedly without getting to an agreement, and of which I would just repeat I never meant any sexual attraction.
And I repeat that I do not think she has been anything more than pleased (very much pleased), either by Wickham or by Colonel Fitzwilliam. Anything beyond was pure rational wish to go further with them.