onObjectHit is only called for objects with scriptedCollisions set to true.

The trouble with trying to make Devan a playable character in AngelScript is that you'd still see the rabbit sprites. You could do stuff with jjPLAYER::cameraFreeze, maybe offset layer 4 some number of tiles to the side and edit every behavior so it offsets its sprites accordingly, but that would be a pretty big hassle. Or you could stick Jazz in a wall somewhere and write your own platforming engine for Devan from scratch. Or you could decide it's probably not a great idea for 4.3.