the added cost of the ignitions is a turn-off; for the price of a couple or few ignition units and spark plugs,
don't forget the On/Off Switch, and the Extension Wire if needed,
on the other hand, as for Gas engines, it's rather easy to lighten them up, you could mix 1/3 Glow Fuel to 2/3 Gas and use a Glow Plug,, no Ignition Box, no Battery, No Plug, No Switch, No Wires,
Jim