I'm a big fan of glow (fly smaller electrics too), but in this application I'd stick with electrics. The plane could be converted to glow, but the launch problem bothers me. (Is there a way to hold it on top and launch underhand? It would be a bit safer.)

To get 10 minutes out of the Norvel you'd probably need a 3 ounce tank. 2 ounces might do it if you throttle back quite a bit. As Jim said, the mess shouldn't be an issue, but the noise might be. The smaller glow engines tend to have a real annoying whine that bothers people. Even more than a .25 two stroke.

Best of luck,
Dennis-