OK, I took the plunge, removed OMV and installed DSM, ran your adapted script and BOOM, faces works!
Installed docker, plex, homebridge, homeassistant & pihole and everything works great.
Re-format the stubborn TR-004 and both are working fine (and are shared over the network).
So right now I'm happy, the only thing is now the 3E92... necessary or not?
Thanks for your help, super!
Regards,
Nongsung