It looks like you could get a small gear puller on it. I doubt it will take very much force at all to get it off, just more than you can apply with your fingers. Another idea is to make a puller with a couple skinny screws that fit in the holes in the cam. Put the screws through and start nuts on them underneath. Run the nuts up the screws until the ends of the screws rest on the base for the cam. Slowly crank both nuts up the screws equally until the cam breaks loose.
A GENTLE tap downward on the cam might break it's bond too. Cushion the top of it with a piece of wood so you don't mar the cam.
Rodney