Would be interested to see your script when you are done Osmo as I need to write one myself for a mission I am doing - you would save me some time and I would probably learn something from what you have done. Also, it may come in handy in Xeno's port of Domination as that can only fix Arma helicopters at the moment.
I've released a Beta version of the "Helicopter Service" script. It's nearly completed, next version will most likely be 1.0. This is actually conversion of a service script I've done for ArmA (never released it publicly, just used in my missions). The ArmA version is larger as it contains service for all kinds of vehicles. I'm going to update that script and release it publicly too in the future. You might also want to check out my other TKOH script (Helicopter Interaction). It is related to this one as it adds actions to inspect damage of helicopters.