Update2: success... sort of. Parts finally arrived so I wired up a cable and was able to upload a codeplug to the #dm1701 using the (windows) #opengd77 CPS.
DIY cable info: https://youtu.be/FOUxxhRien8
#qdmr and #dmrconf still give errors, though.
@dm3mat I'll update my bug report probably tomorrow.