Stepfamilies and buttonholes/corsages

Hi,

Both my parents and H2Bs are divorced, with both my parents and H2Bs dads having other partners on the scene from our teen years. All are remarried and official ‘step’ parents.

H2Bs mum has recently acquired a boyfriend. There is an unpleasant back story here and he hasn’t done much to show us he has changed. Initially he wasn’t actually invited to the wedding being quite new however we’ve now invited him to keep MIL2B happy.
MIL2B is now asking about buttonholes for the two of them… Initially I was thinking just groom, best man, page boys and my dad who is giving me away for these and none for the women, however it seems both the mums are unhappy about this. How do I navigate this? Can we give the 7 biological and step parents something and not the new boyfriend? I barely know him and certainly don’t trust/like him so don’t want him being recognised as ‘important’ however that feels harsh. Or do we just give them to the men involved and upset both mums? Either way H2Bs mum will be upset as she understandably thinks her new man is great and would want him involved in the same way as the step parents who have been in our lives for many years.
To avoid all the politics there’s just me and H2B on top table also! Help! And thanks!