I'm not giving up hope for an epilogue kiss just yet. We know Larian is still working on kissing animations, and that Astarion's have been bugged previously. If they had one, but it wasn't working properly, I can imagine Larian just setting that content to the side for now in order to ship the epilogue out. Something like that would also explain why Astarion's epilogue content seems somewhat lacking in general (for both spawn and Ascendant) when compared to the other companions. They would have needed to snip any dialogue pathways leading up to a kiss.
Even Spawn doesn't have a kiss, just a hug whereas from what you've said other companions have BOTH kiss and hug options
