Can CH cats be insured?

Not usually, Cerebellar Hypoplasia is a congenital condition, which is deemed by pet insurance companies as pre-existing.  Some may offer a limited health-coverage plan, though it is generally not worth the investment as any health issue that can be determined as being caused in part by your cat’s wobbliness (such as chipping a tooth) would not be covered.  You may consider setting up a credit card or special savings account to contribute to each month in the case of a veterinary emergency.