RE: giving a stihl 020 AVp a shot
Glow gas in a gasoline engine? I think you are going to have to figure out a way to increase the compression ratio a significant amount. Do they make glow plugs to replace spark plugs? If you are running a glow plug you should only need a battery source to start it. Are the carburetor rubber parts compatible with nitromethane and methanol? Will the port timing accomodate glow fuel? If you haven't removed the fittings to mount the magneto I would reinstall the mag and run it on gasoline with a 20:1 two cycle oil mix - Castrol 2 cycle oil (not castor oil).
Interesting project.
Bill