I've wondered about this since the days of MBs. How would this work when they actually arrived at the parks, booked FPs, made dining reservations, etc. Would they switch bands from the very start and remember when booking that Tom was actually Betty and Betty was Tom? If I understand correctly, each MB would be to a specific room and in this case the husband and wife would have their MBs linked to different rooms.
My hesitation in offering to find a loophole (ie. book 1 room under husband and a separate under wife) would be that it would backfire when they actually arrived at WDW. Have you ever heard of anyone doing this aaarcher86 and was it successful? MBs and their intricacies overwhelm me when trying to do something like this.