There will be virtually no fuel leakage from the solenoid hole if you remove it. The problem might be to get a wrench on it to get it out. Should be very sure that it is not working first.

The glow sensor is actually a switch and should be closed (hot engine) or open (cold engine). If there is leakage around the switch that reads less than about 30k ohms you can expect a cold engine to not glow.

I think one could also squeeze off the fuel feed hose to kill the engine.

Paul