10% gas is not a big deal. There's a big thread on this forum about the gas/glow mix and the percentages that you can run while still continuing to use a glow plug. Link:
http://www.rcuniverse.com/forum/engi...-glow-how.html
You will not be able to use a glow plug if you run 100% gasoline unless you use a glow plug driver that is set to be on all the time. At that point, why not just do it the right way and use a CDI system?