If anything, making it break combos makes the most sense.

It is literally a skill you use, on GCD that isn't part of your combo.

Similar to how stun breaks your combo, and shield toss.

Kinda defeats the purpose of combos if it didn't.

I like the proc idea but am unsure if it is necessary. It is already a useful tool and I use it on every fight when there is downtime.

It doesn't have to be useful while you are MT to make it useful.