I doubt he would make an 'epilogue' if he's already doing multiple endings, though.
Personally, if he's gonna do something like that, I would instead prefer a collection of "Alternative Endings" to both be fun and satisfy everyone's tastes, like, you could have one ending where Kirito's life is completely ruined for those that can only get hard seeing him suffering, one where Inoda loses NTR MC immunity and gets screwed over by reality like Hebishima was, one where Suguha actually Wins, etc! That way everyone would feel satisfied even if they're all non-canon endings XD