I do this with all my 2-stroke glow stuff, but when I tried it with my 170cdi it fouled the plug on the first start more than enough times to convince me that it wasn't worth the hassle. The popping and banging was scary enough, most times it would clear itself and keep running, other times it would just stop firing and wouldn't even pop again with the starter turning it over so you'd have to pull the plug.

I just shut the motor down with the throttle, drain the tank and put the plane away although it's only about 4 weeks max between runs. Replace the bearings every year and no signs of rust, but I live 100 miles away from the closest ocean and don't suffer from high humidity. I also try to leave the engine in a position where the valves are closed and the throttle barrel is shut (ie not cracked open in the idle position) so the engine is "sealed". Can't say that it works but leaving the throttle half open with a valve or two open as well just seems to be inviting moisture (and oxygen) into the engine...