--It's very fortunate that, as I understand it, your cat has no trouble walking. Still, I remembered this video I'd seen once that links to a Facebook group with information about caring for cats with paralysis. Maybe they'll have some additional resources for you, and be a place to ask questions, get advice on if it is appropriate to use diapers, and (if yes) when, and what kind of diapers to use, etc.
They may even be able to put you in touch with vets who have experience in these areas.
Good on you for taking care of a special needs cat.