CleverNickName
Limit Break Dancing
This seems perfectly reasonable to me, though it does have the same potential problem that channel divinity had when it was prof uses per day of being very abusable with multiclass dipping.
I could fill the entire forum with multiclassing problems in 5E. It breaks so many parts of the game, it's no wonder that they made it an "optional" rule.
We use different rules for multiclassing, specifically to prevent this "dipping" phenomenon. I won't go into too much detail so as not to derail the thread, but the gist of it is this: if a character wants to multiclass, I work with the player to write a whole new "core" class that combines the two classes. We don't do it smorgasbord-style like the DMG suggests.