I think having the objects repair themselves is the answer. Its a simple thing to do, just lots of times.
from each target on the map I do the following
Issue "on killed" event message to a 5 minute timer
the 5 minute timer sends a message to a repair command
the repair command is linked back to the object.
I can copy and paste the commands just need to do the linking....
or....
I delete all the objects and start again by adding say a T34. Set it up to repair and then duplicate it x times at different ranges.
repeat for each type of object I want on the range. That would be just multiple copy and pastes, perhaps also give me a more ordered approach to the targets say 3 or 4 of each at each range.