You don't Have to bypass anything...
Insure that tractor is in neutral (so it won't run over you).
Temporarily Jump from the large Positive battery cable on the starter solenoid to the small terminal on the starter solenoid... That will crank & start the engine.
WARNING SAFETY RANT
You have got to be joking! You are suggesting a very dangerous practise! I know you have said to put the tractor in to neutral first, but if anything can go wrong , it will. The only safe way to start the tractor is with the clutch depressed. This involves someone sitting on the seat.
Weedpharma
Thanks for this thread people. My B710 is sitting in the driveway after changing the trans/hydro fluid and filters now, it wont turn over. I'm just curious if I spilled some transmission oil on the switch. Can someone tell me where the evil thing is?The L48 is not a geared tractor so remote starting it will not cause it to move even if it is in gear. The HST pedal has to be moved forward or backwards to engage the HST.
A remote starter switch makes getting power to the starter solenoid. Those are made for the exact purpose the OP is looking for. Others have used such a switch for years. If its use killed people the nanny government would ban them for sure.
12 Volt Remote Starter Switch