Changing the Rx is no problem. Here is a LONG thread about it. It is about the best mod one can do to the CP.
It takes a fair amount of work to get you computer Tx set up just right, and some servo arm adjustments (so that the servo arms and swash plate sit perfectly level with zero sub-trim or dial trim).
I the long run, it is well worth the time. The way the heli can be made to fly is 500 times better than the stock CP radio.
Don't come off the throttle untill you see your GOD!