I'm going to suggest two pry bars with one on each side of the crankshaft gear. Doing a light see-saw motion with the pressure alternating on each side of the crank gear may do what you need. I've got two heavy duty screw drivers that work well for this. I do like using gear pullers for removing stubborn crank gears but in this instance, the gear puller could damage the chain. In most instances, the chain has worn enough that the camshaft gear can be removed first.
If it still appears that much more pressure is going to be applied than you feel comfortable with, then take two thin pieces of steel or aluminum placed behind the gear to help the pry bars more evenly distribute the pressure. At this point, you'll likely need another set of hands to hold everything in place while you try see-sawing the gear forward enough to remove the camshaft gear.

Lorena, Texas (South of Waco)