RE: Eliminate ignition battery?
I tried E-85, which is 85% ethanol when I first started with the Gas/Glow experiments, and wasn't happy with the running characteristics and so the switched to the Gas/Glow mix as we know it know. Methanol is different than ethanol, and it is the methanol that creates a catalytic reaction with the glow plug and helps keep it warm.
Most of these engines do not use the flywheel as part of the overall engine balance. An exception is some Ryobis. (I have only run across a couple of Ryobis balanced using the flywheel to assist in balancing in numerous years.)
AV8TOR