Surely there must be a rule that if any player has an involuntary or voluntary reason by which they keep hurting the other players, then that player should be taken off the team. End of story. (And that would be equally applicable to a man playing on a mans team so not a discrimination issue)
As it happens there is a very simple solution to this particular situation, that the player joins the appropriate team for their sex, the men’s team. However even if there isn’t a suitable team for a player, then that is just hard luck, they can’t stay on the team voluntarily or involuntarily causing harm to the other players, however much they might ‘just want to play rugby’.
‘Single-gender’ sports teams are clearly unfair and dangerous to women players because of male biology which arises from sex difference. That bigger heavier taller stronger Male biology isn’t just about specific hormone levels which could be changed. That physical relative advantage just is what it is and it can’t ever be changed. It’s dangerous for official rugby powers-that-be to choose to keep pretending. and Its the opposite of inclusive to choose to include players who you know will hurt other players and who willl cause other players to not play at all, for their own safety.
It’s also deceptive and manipulative gaslighting and an undermining of consent norms, to present risks to players as being within the normal expected range of risks, when actually the powers-that-be already know that the risks in this scenario are much greater than in the normal expected range.