There is one solution i think...
Create a script like this. When the unit is dead (i dont know the script for this but i'm sure someone others do.), exec "dead.sqs" for exsample.
In the dead.sqs file u have this.
(name of dead unit) setpos getpos objectname
Explanation:
When a unit is dead it will automaticly move to another posision. For exsample in the middle of the sea. Just create a object there like a helipad or something. Call the helipad what ever u want but put the name in instead of the objectname.
Hope this can help a little...