Well, I called my friend the real estate lawyer, and he pretty much confirmed what I knew. He can't think of any legal remedies other than the one I pursued and a couple I rejected early on (suing the seller or the home inspector--I have no reason to believe any of them had a clue that this disaster was in the offing--there was no visible damage when I purchased the home). As I suspected, title insurance doesn't cover this sort of thing.
So it looks like my best option is to find the best deal I can on a loan of some sort. It will all get resolved--I'm just hoping to get the best terms that I can. There IS a small local bank that I used when we purchased, and were building, the winery. It's actually one county over, but maybe not the best option since I recently so happily shredded the documents pertaining to that piece of property (that I owned with my last ex). Just seeing paperwork from First National Bank of Bad Memories would probably give me agita.