Thanks for the link. If I understood it correctly, this replaces an ability with spell shield, which then shows the cooldown.
So when casting an ability I would save the cooldown duration. If the cooldown should be paused I save the remaining duration and if the cooldown should be resumed replace the ability with the dummy cooldown ability using this system.
Should work, but I think in my case it's just not worth it to use such a system, as it's only for cinematics.