A very difficult environment to operate in safely particlarly when the contract has limitations imposed of the kind already mentioned. If you stand out from the crowd you make yourself a target, as a helicopter you are a kudos kill for insurgents, something to boast about. When you are operating into regular haunts by yourself with limited self protection you are going to have problems. Varying route, operating heights, and timings are good procedures however if the landing point is the same it focuses a strike option to that location. Lots of low tech communications, mobile phones, giving your time of lift and direction of travel will be used to plot your downfall. I would sugest another chat with the contractor.
Good luck
