(Save Editor + Blender)
I guess this works well enough as a pop-bumper. Using a Sphere Creator, hooked up to a ByteBeat with ByteBeat Switch to pulse the spawning. The sphere wants to naturally get out of the collision state and climbs up because of the angled surrounding. Then it gets reset again, causing it to be forced down again. Rinse repeat. A hidden Floor Switch will trigger it all. Ball goes close, bumper activates, ball gets pushed away.
Animated 2 frame image. Does reasonably reflect the idea.
Edit: Of course the pinball is small enough to fit below. (bumper 1.6x vs pinball 0.6x)