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).
So yes he might have accepted his current status and if he can walk in the sun he'll be happy. I'm up for that 100% but its all too vague as it currently is in our last conversation. It's not presented more optimistically and hopefully, more a sad comment.
So why can't we have a small quest for that before the ending, some item or potion that will enable it, thereby cutting out the dock scene entirely. Doesn't have to be in Act 3 A puzzle room in the temple of Lathander (or the Arcane Tower in the Underdark) very well hidden with a daywalker amulet as the prize maybe, thematically it would fit in either. Everyone could be happy with that as its player choice whether to pick it up or not.
The final scenes (which are effectively completely nondescript currently) should at the least open up more possibilities including mentioning cures (for him or anyone else) which are available in DnD5e, he has never expressed an opinion because they are never raised as a possibility.
Plus I want to be able to hug him not fold my arms and look at him from a distance.
