I have an OS 15gt that I have had to replace the kill swiitch module twice. Can I convert this engine to a ggt15 that uses a glow plug and elimate the ignition system?

I am building a Carl Goldburg Tiger Two model. I am thinking that a Saito 40 would be a good engine for it. just completed a Telemaster 66 which is out of production. I installed a Saito 72 in it. It seems to be over powered.