I like the idea, but I don't think it would meet the guidelines.
But they are, after all, guidelines only - not hard and fast rules.
If you explained the concept well enough, and got a reviewer onside, it could well get published (?????)
I had a similar idea a while ago - one cache, but 3 separate "inner " caches - with an option to do the cache a variety of different ways (puzzle, multi, or traditional) - but I haven't put it into practise yet....!