Hi Hiro, thanks for your feedback!
You're right, River really dragged a life of solitude behind them and I think only one ending truly sets them free. In this one, they are now faced to the little time they have, but I like the idea of it still being significant: it's never too late to live again!
And I agree with you, had I been Ambrose, I would have been HORRIFIED by the fact River chose to revive me without my son: I would understand that River doesn't revive their son at 72, since they wouldn't be able to raise him, but at least let me be dead!! And your headcanon is quite interesting (somehow, River would look to have a marital life with Ambrose as a non-feminine figure... I didn't think about it that way but you're certainly touching on something relevant...)
And sparkles!!!!