I might try a sling.
Is your dog trained? Can you tell your dog to lie down, and then when he is in a prone position give him his bowl with something very tasty in it, scrambled eggs, maybe. The idea would be to encourage eating in a prone position -- some of my dogs prefer this, other stand and bend over the dish to eat.
It is getting to be that time. It is probably a good time to start a daily diary, and mark down struggles, pain, new symptoms, and to mark down when he is happy and finding enjoyment in being around the family, comfortably resting, playing, eating.
I don't know much about wheel chairs. I think they are for dogs with total rear paralysis. Sometimes the back legs will drag, and sores will develop. Trouble with steps, and trouble with doorways, hallways, getting into a crate, etc. I don't think I would use one to prevent falls or because getting up and down is hard. I would consider it only for when walking is impossible. But I could be all wet on that.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.