>Just sucks to have to pay a few grand to clean up someone's toxic half assed job from 40 years ago.

You are paying that to prevent it becoming your toxic problem. Worth it. Also might be worthwhile to have your lead levels checked because just opening that area up probably disturbed a bunch of lead based paint dust.

You could seal the room off with double plastic and tape sealing every doorway. Open a window in the room if it has it and tape a fan into the opening blowing out, to get negative pressure. If you have HVAC vents, disconnect them from the ceiling and tape and seal the ends of the supply. Do the same if you happen to have any return in the room. Obviously turn off HVAC. Buy a nice full face shield mask and a tyvek suit from a big box store. Buy a shop vac with a dust filter AND the bags that go inside that capture everything you suck up to save the filter. Buy a couple boxes of contractor bags and seal yourself in and then tear out everything and bag it up. Would cost you like a couple hundred dollars, be pretty easy and essentially have zero risk of any contamination or health problems. Vac the room twice, take the bags out and vac it again. You'd be more than fine.

I've done like. . . a dozen or more of these tear outs on similar houses. Most were in much worse shape than what you are showing.