Quick way may be to get yourself a Foxie dog. Probably not a pup as you would need time for it to grow, etc. But maybe a rescue dog/SPCA/etc?
Those wee Fox Terriers are great on bunnies. May need to calm it down when it sees your cat though!
A Foxie is lethal on bunnies, and what it can't catch it will scare away (maybe to your neighbours place...but that's their problem then).
My old mate always had a Foxie or two on his place. The wee sods will do in a hare too (if they can catch it).
Make a great wee companion dog too.
Bookmarks