Perhaps possible to take the plug to the hardware store and hold the replacement bolt same outer diameter against the plug
looking against the light checking so it is the same pitch
Now for problems if it is a model or MC with a check that neutral is in before starting if you remove the neutral switch which is an electrical mechanical device. I would assume that the electrical signal that is enabling the startup is missing and the bike wont start. Safety protection.
If it is an older model .It can be a surprice going for a full force kickstart while in gear
and on kick stand .the bike will jump forward and perhaps fold the kickstand. You are then .Trying to wrestle the bike up again
And If failing soon be on the internet trying to find a new blinker and shiftpedal