Hi RareBear, interesting youtube but unfortunately no go on any of the info.
I've re-checked the website for AlfaDiag and they do not list any 164. Just on the offchance something might have changed and you knew of a way around I contacted them direct.
For anyone who has the same question, I received an email from AlfaDiag and as of the time I write this AlfaDiag does NOT support the Alfa 164, more specifically does not support the Motronic 1.7 which is used on the V6 24v
If anyone else knows of another method, a tried and tested one would be handy, I would love to know!