You could just tape the key as said will work fine, it's detected by a sensor around or on the barrel, not inside the barrel.
Why not convert your engine to multipoint ie C16SE, use a C14SE head though as much bigger valves than a 16, they are very good engines next step up would be LET etc.
You could easily get a reliable 140bhp from a decently tuned C16SE.
tabetha