I'd rather have Peter crush on Liz, get rejected, have MJ be his safety net in terms of the dance (her introduction ripped from the comics), they mingle and become friends (as the film is coming to a close).
No relationship needed. Just give us 616 MJ with a bit of Ultimate.
This is what I want as well and what I think may possibly happen if the first casting news from Zendaya ends up being true and she plays a smaller role in this film which expands heavily in future installments. It would also fit with "she's not the love interest" for this film because their romance can blossom in the sequel and beyond.
I really like the idea of Laura being Liz and I hope that ends up being true.