The Tekken 6BR manual is online and it has the wiring diagram for the readers, it’s the same wiring as the banapass card readers. I did hear the 357C/369 might have issues with the T6 readers but I cannot confirm that as I don’t have the readers or cards yet
An easy way to identify offline versions of games is by looking if they have the card/online icons on the bottom right or left. Offline versions do not have the icons present
Honestly, I would like the system 11 multi just to switch between different versions of Tekken 2 or Soul Edge on one board. Very useless to many but would be nice to see :)