A year and a half later, and I finally got it fixed! The first time I tried to fix was before winter in 2022, and I only tested the 2 safety switches under the seat (PTO, and Neutral safety switches). I did this by switching them out with a new safety switch I picked up at the Kubota dealership, and there was no fix.
This weekend I finally did a teardown, and it ended up being the clutch switch, that was not pressed in deep enough, when the clutch was pressed. The original safety switch was functioning properly after adjusting it down.
A few notes:
3 Safety Switches (at least the 5T057-42230 part #):
PTO, Neutral, and Clutch
All 3 safety switches, must be compressed to start with key.
The instrument panel, dash plastic, steering wheel, and hood are very difficult to remove without a manual. Kubota really screwed the pooch on this. Lot's of yanking, and wiggling that should be much easier on a tractor. I get why they do it on cars to make them look pretty, but there were many bolts that required universal socket joints.
I will concede to Kubota that all the bolts had the nuts welded to the metal, which eased my mind on losing them.
The clutch safety switch can be seen from the bottom the tractor, but it is much easier to remove, and adjust by removing the hood and orange metal (they're connected together). I really should have recorded for you all, because there were no tutorials on YouTube, but hopefully it will be quite sometime before I have to dig into the tractor again.
AND FINALLY make sure to connect all the starter wiring back properly after you've been starting with a remote switch for a 1.5 years. I forgot to connect the little solenoid wire, and that probably wasted an hour or so.
Battery light is still on while operating???
Good luck out there y'all, and Thank you for the help on this thread.
Safety Switch part on Amazon.com with part numbers (5T057-42230) etc.: