Fat Friendly Beauty Parlors
My mother called a salon and asked that very questions once. She was so upset because she needed the service but hated the feeling of that "private" conversation when she walked through the door. "Which chair can she fit in". The woman was so incredibly nice, she had one of her stylist go to my mom's house for a cut/style. My mom ended up using that woman for a while. She's 2 1/2 years out from WLS and goes to the salon every chance she gets.
So I don't know if you've thought about calling around to see if any of the salons near you can do an in home service, but it might be worth a try.