danach

So as the title suggests, I am try to make support only available AFTER a specific task has been done. In my scenario, I want to allow for a unit to call for artillery only after an object has been destroyed. I have tried syncing the requester and provider with a trigger to no avail. I also tried messing with the condition of presence for the artillery unit and the two support modules to only exist after destroying the aforementioned target. Anyone have any suggestions?