At our expense.
I say a short chain around the neck on a public street, and let anyone so inclined bring him an occasional PBJ sandwich.
I have mixed feelings about providing him that for life, but I think that ultimately it would be cheaper than to live with the consequences of him being free, deported, sneaking back in, and running his business.
It’d be a greater expense to provide for all his human cargo.
However, I really do like your idea.