If I split the engine, I can remove the crankarm from the crank and cut the cylinder open outside of the engine, where I don't have to worry about about debris getting in the crankcase. It would also be a lot easier to cut it that way. I'm almost scared to ask: is it really that difficult to split the engine? There's a photo guide on this website that makes it seem relatively simple...and to someone with good mechanical skills, it probably is. This is the first engine I've ever worked on in my life. Of course, I bought my HT kit to learn a bit about working on motors. I just didn't expect my education to be completed so quickly.
So -- if I can't buy another motor, should I split the engine, or try to cut the cylinder while it's still attached to the motor by the stuck piston? If I cut the cylinder while it's still attached, what's the risk of getting potentially harmful debris in the crankcase? (Pretty high, I'd imagine.) Or is it possible to remove the crankarm from the crank without splitting the engine? (I wouldn't think so.)
By the way, thanks for the responses to my question. I really appreciate it!