I don’t have cerebral palsy, but I’m rehabbing from a traumatic brain injury and complicated spine injuries, and I use a bareback pad. I agree that 1) $$$ - hard to find the right saddle! I’m very fortunate to have found a great saddle before the injury, but I’ve yet to ride in it since, so I don’t know how that will all work out yet. 2) Feel is MUCH better bareback! When I first started riding after the injury I only did bareback because I had much better feel and balance that way, ironically. It also made me use my core to maintain my seat and balance, rather than depending on my stirrups. 3) I have MUCH more freedom of motion bareback than in a saddle - I do a lot of stretching and pilates-type work while riding to increase range of motion and build strength, and this is much easier and targets the muscles I want much better while riding bareback.
Sounds like a bareback pad is definitely the right choice for you!