Just to update this thread, x has manufactured and is selling an adapter. RED on one side, ARRI on the other. Cost is $99
I started searching myself to see if I could easily mount O-Grips with the OConnor rosette adapter to a Clutch. (That won't work - the OConnor rosette adapter matches the ARRI standard).
As added info: WC is also producing a Bolt-on rosette (mounts with 1/4-20's to any cheeseplate) Available in both RED and ARRI standards.