If the first lawyer told you that an eviction would cost $50k-200k and the second said he would charge $4k for it, alarm bells should have gone off at that point. That price was too good to be true.
You need to use some unconventional methods to get these guys out. Get a camera set up in the kitchen, figure out what amount of money is felony larceny in SF, leave that amout of money on the counter, then after one of them takes it, wait until they spend it, report the theft to the police, show them the footage, he gets arrested and taken to jail, after he gets out, make another (reasonable) relocation offer. Hopefully he gets the hint.
I’m just spitballing here. I don’t know if my last suggestion really is any good. Maybe the police don’t even arrest thieves in SF anymore, but I think the eviction route is a dead end for you and you have to think outside the box.