Maybe after they get use to the routine they will not be a problem. My friends who lived next door bathed their kitties regularly and I don't think he had a problem with them.
All I can say is GOOD LUCK!! I'm sorry about hubby's allergies. Bruce's brothers are allergic too. And one lived with 3 cats for about 20 years. They now have a nice indoor/outdoor (protected) house of their own in the backyard.