Today I placed an order with Martin Lynch for the above. I was able to negotiate a decent deal both with MLS and with W+S, but decided on the former. Delivery should be this week. This should allow me to WSPR on one band and operate with other modes on different bands including 5MHz. My original FT817 has served me well and the FT817ND should serve me for years to come.
I have separately ordered a 250Hz CW filter for the new rig.