Have you seen the large enclosure that Tubby & Peanut's Mom has? It is huge and wonderful! It even has room for a catnip plant out there. The top has a cover so they are safe inside yet it is like being outside with the fresh air and sunshine. This might be a possibility for you! I bet Cubby would love it
I remember seeing pictures of that now that you say something. I might have to try to talk hubby into getting a few tools to make Cubby a little enclosure outside. He wont have the problem buying the tools but he might think I have a few issues if I tell him why. He never understands.

If he doesn't agree to the enclosure then I will keep him inside at all times unless I get him into a harness.