Hey marcinko!
It is possible to do. All that you have to do is edit the script in the extraction file to use the BAS chopper of your choice. You must change index # 4 to use the BAS chopper. See below:
_west_mission_one_bh = ["1 x Blackhawk",1,0,[35,40],["UH60"],false,60,[]]
Where is says "UH60", just change that to the chopper of your choice and you will now get extracted in a BAS chopper! ;D
If this is not clear enough, let me know and I will try to explain better/simpler.
Wadmann