Hi Nick, Bruno,
I recently commanded a complete clutch kit from Suflex, Italy. For 2/3 of the price of the OCT friction plates, I got the complete kit including friction and steel discs.
If it meets expectations, I'll post the suppliers address.
For offroad riding you should use the clutch springs of the Zanes, they need a bit more force on the clutch lever, but it's still miles away from a 750 Breganze clutch
Franky