Guess I answered my own questions. I'm now successfully testing with the following changes to Iggy's instructions:
4. I chose the Edision Mio 4K, from Titanium Satellite.
5. Flashed OpenATV 6.4 to a spare multi-boot slot.
9. Needed to add a password to E2 (default is blank) to enable FileZilla to connect.
10. No Softcam Panel on 6.4. Googled "secret/feed" to find a plug-in that facilitates downloads and installations. Installed the plug-in, and selected NCAM 11.6, which also installs itself. Softcam Panel is then visible under "Decryption & Parental Control".
11. Needed to add Iggy's configuration files to etc/tuxbox/config/Ncam also.
12. The Key files are outdated. Found a comprehensive one for the Americas, and added it to etc/tuxbox/config/Ncam.
13. Couldn't connect to OpenWebif using Chrome. Works ok with Explorer.
Hope this helps somebody.