It would be a nice option and tie right into established lore we know by the endpoint of the game. It would be something of a potential resolution, even if Gale just promises to research it. Even a spell that has to be cast daily and is more of a temporary solution, or even imbued into a ring or something provides some resolution and isn't the total disconnect we see at the end currently.
Well, Cloak of Dragomir exists so... yes, it was an addition by Beamdog to BG2:EE but still, for all intents and purposes it exists.
So Gale, or even a cleric via Divine Intervention could try to recreate/summon an item serving a similar purpose. Since it's unlikely Hexxat is dead and would voluntarily part with hers, so Astarion would need something like that tailored just to himself. Possibly.
