Yes please, let's chat about spawn Astarion for a bit.
The player character in Astarion's romance is in general not the most emotionally warm creature, unfortunately. There is a "you are the person I love, the person I want" during the graveyard scene, but in general there is little opportunity to tell him that he, as a spawn is awesome and that you are his greatest fan - which is a pity.
I very much agree there is very few options to reassure him with positivity and it shows as he still doubts himself in his last stages of his arc and epilogue. We really do need a heart to heart bit similar to his confession scene in ACT 2 as we don't see further growth from him after the cemetery scene .
The looking for a cure to his vampirism is basically the true resurrection spell that Gale has if I'm right reading the DnD players notes on it and now Gale can grant this request if he's a god this really should be a Tav and Astarion tale to tell their friends at the party.