People get jailed/locked up when they are a physical danger to those around them. The reason jails are the way they are is not so much to punish the inmates but far more relevantly, to protect them from one another. As it turns out, unfortunately, much of the supposed problem with the really long term homeless is that, rightly or wrongly, they are perceived as a physical threat to others. So, even assuming the best possible intentions on your part, whatever place you put the homeless is going to look a lot like jail.