I have my two best friends standing up with me, and I don't particularly want to distinguish between them (we've all agreed to basically "split up" the MOH duties at each other's weddings, rotating who did the registry signing. I'm the last to get married, so it has worked well so far). On the groom's side, FI and his best friend are no longer on speaking terms, meaning that he doesn't have a best man, just his two groomsmen.
I thought we might just list the WP as Bride's attendants and Groom's attendants in order to avoid awkward conversations about why there is no best man. Would I be breaking any etiquette rules by doing so?