make a new trigger x (names dont matter)
Events
(none)
Conditions
(none)
Actions
Wait (tree regrowth time)
Revive Dying Destructable at blah blah blah
new trigger y
Events
Elapsed Game Time is .01 seconds
Conditions
(none)
Actions
Pick every destructable in playable map area (matching x) and do actions
Add an event to trigger x which is Destructable - (Picked Destructable) Dies
I'm writing this from memory, so I may have a few names, etc wrong.
Also, I'm pretty sure the GUI way of enuming destructables can pick up any number, but it may only pick up 64, same as the event.