I would not advise using any chemical strong enough to dissolve Honda-Bond on an aluminum engine block...heh. Anything that potent could dissolve the aluminum along with the silicon. You shouldn't have to use extreme force with the hammer, just a couple good knocks. Like the same way you got the rear seal off the block.

I'm trying to think what all attaches to the front of the block around the crank. Do you have the crank pulley off? That's a key thing. When I took mine apart, I wasn't able to remove the pulley (stupid crank nut), so what I did was knock the rear seal off, and then tilt the back of the crankshaft upward a little bit to help twist the oil pump loose. That gave the oil pump enough space to get the dowel pins out. Obviously I had the crankshaft main bearing caps taken out when I did this.