Or am I relegated to deleting the disabled loon and recreating a new loon in his place?
Yes you are...
I wonder what went through BIS minds when they made the disableAI a public function, but no function to undo that...
I think even VBS lacks the function to re-enable AI...
Or try using the stop command instead of disableAI.
doStop (I think stop does not work anymore?? at least that's what some comref claims...) has a few disadvantages, one being that it doesn't stop AI from shooting or reacting in any other way to the enemy and it has some odd bug that makes a unit that has doStop in it's init field automatically face into direction 0, and that can't be changed...
If you setDir the dude he turns back to facing 0...