Internally, the DSS module's antenna does basically 'snap' in to the board like the Spektrum system. However, you can rotate the antenna on module about 270 degrees around so there's no need to move anything to one side or the other. If you don't like the look of the small antenna sticking up then simply lay it on its side.
As for modding the spectrum's antenna to run it up to the main antenna of the M11 or M8, there's absolutely no need for it. The output is only 10 milliwatt on the DSS system, but that's plenty of power to transmit where you don't need any more power. You won't be able to tell which way your car is going by the time it gets out of range.