Happy Ghast can be pushed by a geysers

Im trying to make a geysers elivator and a happy ghast is the perfect fit but it is not working, it cant be pushed i was looking in to it wy and apparently its cuz their flying AI i dont know what exacly. If you stand on it tho the game renders it as a solid block and solid blocks cant be puched to (of cource), mojang can you make a change that happy ghast can be puched? Thank you!