Arospec Battler Coming Out Windows
Writing Arospec Battler in my aus thus when Battler could breach the topic with Beato in canon...
1)During EP3: to communicate his opinions on the narrative of humanity being tied to love(romantic and sexual), to defend Kanon and Shannon.
Virgilia MIGHT help Battler defend his stance if he reveals that he personally doesn't feel romantic attraction and asserts one can be happy in spite of that.
I could see EP3 onwards Beato(likely after a big argument) considering the idea if he shows more proof.
The EP3 betrayal would kill further talk about that topic in EP4 however. It could get brought up again in the context of the test and Beato saying he can put the name of the person he values most rather than just a romantic interest.
2)Pre-EP6 with Chick Beato: extremely unlikely given how much she reminds of the old Beato and might feel like she accepts that part of him without understanding it.
3)Post EP6: simultaneously the worst and best possible time for it
Worst because they just got married and someone who lived in the 80s would (in my eyes) understandably be at least a little mad to not have known beforehand. Instead of a golden dream, it's pyrite fool's gold.
Best because Battler allowed himself to be trapped in a logic error to protect Beato's heart, demonstrated that he understood and accepted the entirety of it, chose to marry her! Those are all proof that he cares so much!
Think of it this way: Someone made you a cake and it has exactly the texture, the crust and icing you prefer, even the finer details you only hinted. But instead of the apples you craved, it has pears instead.
Do you think that ruins the whole cake?