Z655 key switch wiring

[feetr2c]

I've had my Z655 for a couple of seasons now, and my main gripe is when mowing under low hanging branches/decorative shrubbery, the key is easily bumped by branches and shuts off the machine. And it's a real PITA to get started again when it's at operating temp. What I want to do is install a rotary master switch down low beside the seat. Then replace the key switch with a starter button. That way, I will have to turn off the master switch to shut down the machine. How can I wire it so the parking brake and PTO safeties remain intact to work as they do with the key switch? The seat safety I'm not worried about, as I have already "fixed" that lol. I can't find a switch wiring diagram online, and I don't want to buy a special manual just for that.