Just gonna toss out there that Girl Scouts have accepted boys within the scouts for years and no one batted an eyelash.
Um, could you provide some examples of this? AFAIK, the official position is to accept biological boys who identify as girls, but only on a case-by-base basis and as accepted by the troop. That's certainly what their FAQ seems to state. They seem to make it quite clear the intent of the Girl Scouts is to provide a emotional and physical safe place for girls.