So, yes, desklink did work and seems ok. So that's good. works for TS-DOS. thanks for that reminder!
Ideally, for CP/M use as well, ability to work with 8.3 file names is useful. Desklink definitely doesn not like 8.3. LaddieCon supports 8.2; I have it installed now. LaddieCon does respond to TPDD protocol, but it crashes after it provides directory information. Some security complaint, did not record the error messages, but I can do. NADSbox is ok with 8.3 file names. Not sure about Backpack. Perhaps a python approach would be good, since I could edit the python code to be 8.3 and 6.2 format tolerant if not already. I'll give that a try.