HCG = returning testes to normal size. Clomid = restarting natural test production. Two different things.
I've not heard anything bad about doing HCG post or even mid-cycle. To avoid Clomid, though, you need to restart the natural test production somehow (or hope it returns on its own).
Do a search for natural post-cycle therapies. Several people, such as Nelson Montana, advocate natural post-cycle therapy, and have posted "recipes" you might use.