edmeyers,
Your idea seems doable. But I think you would have to use a relay or two or maybe just go with two toggle switches(but that might be confusing).
I think there are switches out there that have three connectors on the bottom. One incoming connector and two out going connectors. Depending which way the toggle was flipped would determine if the switch was bein used or not. The switch would be similar to a head/parking light switch or you could use key switch( from an older model car before locking steering wheels).
By-passing switch is easy, setting up toggle switch for start or no start is easy, but to leave switch operational plus being able to crank the eingine without clutch pecal being down is a little more trickier.
Four wheelers like the to by -pass switch so they can crank the engine/drivetrain in gear to get unstuck.