Well, I feel like an idiot. I had some time this afternoon and decided to start pulling the turbo to check where the turbo gasket had failed and possibly install a copper gasket between the turbo and adapter flange. Got as far as pulling the turbo intake and the compressor outlet pipe off when I realized the junction between the charge pipe and the intercooler had come off.
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Turns out all gaskets on the turbo are just fine, it was just losing all boost out the disconnected charge pipe.

I drove it to town and back without incident. Still burns oil from the worn valve guides and seals, but at least it is drivable now until I get around to swapping in the new engine.
The Prado hasn't really been more than a couple of miles from home since early June this year, and has spent a lot of time parked in the weeds next to my
shop truck so the mice have moved in. Going to set some traps and then deep clean the interior this weekend.