Well, looks like it should be working:
New message from: retrocomputershack
If you have v2.4 of the Oric lead (written on the Scart plug label), then this is OSSC compatible.
CSYNC signal has been attenuated to to about 640mV Pk-Pk
RGB Signals have been attenuated to peak no higher than 1V Pk-Pk.
Guess I’ll have to see if I have the budget for it after Christmas 🙂