you could be manager of the youth team or a reserve team at a club and work your work through it until you get proper manager's job like Pep Guardiola did at Barcelona?
i suppose that would be good to prove you are a good enough manager but you have to then work with what players you get with the team and no ability to control signings so it would be a good challenge but not one i would like too often
Interesting idea but what would annoy me is your chasing the under 18's league for example and your top scorer has 20+ goals then the big cheese teakes him away from you just like that.