I wasn't thinking about this in the right direction...
I was, of course, thinking in the direction of how MOST people are using PSK and othe digital modes...
Through their computer soundcard, and using the microphone input, or other audio input, on their SSB radio.
I suppose that the problem you'll be facing is to be able to drive the class-e stage WITHOUT distortion..
Maybe just as simple as pushing the button and trying it !
Try it at a low level, and check the output for spurious signals etc...
Maybe Floyd, who hasn't been heard from for quite a while here, will comment .