Jersey has one huge rawhide. It's about 10-12 inches long. She's only allowed to chew on it when I'm with her to watch her. Once it softens and she can break peices of it off, I take it away. She only gets to chew on it every month or so. She knows where I keep it though and sometimes I'll find her sitting in front of the closet crying. Otherwise, she has her Nylabones (the durable ones) and her squeekies.
Not even a stuffed kong with goodies? That's Chloe's favorite, and frankly, most other chewable treats (rawhides, nylabones) she buries first and takes out later (maybe days later).... so I don't give them to her. Nylabones yes, but not rawhides.
I understand your will not to watch him every second of every day... but he's still a puppy, and this stuff is dangerous for him.