I'd go along with that, walking in the sun is what he wants more than anything. But again it still leaves the issue that his lover will grow old and die leaving him alone. My personal preference would be to initially have a way to let him walk in the sun (and lose that damn dock scene above all else).
But that there are choices and quests that lead onto other things for him and me as his romanced partner that are talked about more fully, along with more interactions generally and not standing 5 feet apart (good grief Larian - where's your soul, never mind his) in the final scenes .
He has no opinion on being cured because it has never been raised as a possibility, the only thing he says about it is back in Act 1. When he says (paraphrasing) 'I'm not a proper vampire, just a spawn, all the drawbacks and few of the powers'.
This brings up a good point. I've often wondered why, during the ascension scene conversation, if
talking him out of ascending after the checks, you can't suggest to him to drink Cazador's blood instead of proceeding with the ritual. It's a way to free him, free the 7000 souls, but maybe save him from himself. He won't be just a "spawn" any longer, but a true vampire. No, it doesn't cure the whole sun issue, but it may be a way for him to be stronger without turning into the complete and total prick from ascension. Like middle ground.
Although who knows, maybe even that would be enough to drive his lust for even more power over the edge and then we see the same persona change that ascension gives him?