I've used a futaba dual conversion xtal in a Hitec rx with no problems. However, this was done on an electric plane with no ill effects.
No issues with buzzing servos etc. I did not take the plane out too far away though. The radio I used was a Hitec Eclipse and the rx was a Hitec 555. GWS xtals will work in Hitec rx's too. I've never tried it but heard of others doing it.

Dave...