There's very little to worry about with EN3 and homo collabs.
As far as likeliness is concerned,
Altare
>Highly unlikely
>last collab was with mori 10 fucking months ago
>If you're not kobo or indonesian, he won't bother
Axel
>Possibly never
>Already has an unlimited supply of collab partners in his JP box
>on track to probably never collab with an EN girl ever again (outside of maybe a group song project)
All of VG
>Very unlikely
>Has stayed in their lane since the very beginning, and it's quite unlikely to change
That leaves us with only the two shitters who, as far as we know, are either terminated or suspended indefinitely. That said, it doesn't seem likely either they're leaving their little calli-kronii group box.
As of right now, the only other major concern is the EN3 girls themselves. If a male collab happens, it will be because they asked for it to happen on their end. Management-mandated collabs didn't happen with VG, and probably won't happen with them either. though how funny would it be if the homobeggars were the new girls themselves kek