I have flown my FeatherLite 25 on 50/50 gasoline/methanol for quite some time now and I still haven't had an engine quit yet!!! this mixture is very reliable specially if you add some NITRO it works much better and give's it an extra punch to the engine, but the real essence of this is to thinker and experiment and getting the satisfaction that you really did accomplish something you were after, besides the benefit of making that engine lighter without having to spend a lot of money to do so and to keep the fuel economy on a reasonably budget specially when you are flying big planes the fuel comsumptiom gets very high on glow fuel alone!!!.
Using 50/50 gasoline/methanol fuel mixture you don't need to have an on-board ignition system at any time but if you are worried about not having enough glow temp you could use it only on idle by some means of your throtle servo(activate only on idle via a switch)