Since the "P" leads from the CDIs are the only means of shutting down the engine on a Rotax, this would be highly unadvisable.

You could disconnect them, or one, from the switch and try rotating the engine (with plugs removed) and checking for spark. This would give you a sense of if the switch is the issue.

Just don't crank the engine with the plugs out too much or you will fill the crankcase with oil. The crankcase pressure is what returns the engine oil o the oil tank.