Ever considered (a) cat(s)? If deployed correctly, they deliver those that they don't like the taste of to your doorstep, albeit often very mutilated (think with (part (!)) of the head missing).
That's a great idea. We live on the second floor, so the cat wouldn't have access to the outside directly, which is complicated. The other issue is the lovely vizsla that lives downstairs - she is scared of cats. But I'd love to get a cat or dog when my life is 10% more stable.
