Take the mobile home, build a small porch by the door and sleep on the porch. That's my answer to this. he's off the street, safe, has a shower and a kitchen to use during the daytime. In a couple of months move his bed inside with his head right at the door. Slowly move back from the door, keeping it open all the time.
There is no law that says you cannot sleep on your porch or keep your door open that I know of.
He said he would have nothing to do with it. But do you think he could be looking at it like a handout?
Love your "creative" approach!...LOL...sometimes the solution requires a little left-brain thinking