Good Morning all,
After my request was denied, I called Kubota's Northeast Regional office directly, and spoke with some friendly people.
24 hours later, I got a call from the dealership saying that Kubota had talked with them, and that the dealership was going to cancel my contract and take back the tractor. The dealerships position was that this was still a good tractor, and since they repaired it, it ws "better than new." They also told me I was free to do business with other dealerships.
So, it's not exactly the outcome of a "new tractor," but it will allow me to do that with a different dealership. I got the sense that the dealership had had it with me, so this is probably a good outcome overall. I'll start a relationship with a different dealer, all of 10 miles away further from my house...
Thank you everyone for your comments, support and insight. I'm a tad wiser now, and I guess you can teach old dogs new tricks...
-Jonathan