Hi Brian,
I just tested it some minutes ago (after updating from a very old WSJT-X version) by using a radio as RX.
It worked with 4/4 sequences, of course the TX was just some meters away 
.
Next, I will try it with websdr.org as input, by re-using an old laptop, but this will take some time.
Such a great idea, thanks a lot for your work!
73 Stephan