I would ask yourself the followng questions:
How confident are you at dealing with ANY problem that may occur, have you had to do any problem solving on the unit in anger? Yes and No
Do you know what your bailout strategy will be, and have you validated that it'll work, and be correct for the dives you're planning? Ran it on ProPlanner, and re-confirmed this as a 5 minute dive to the same depth on OC
Will this dive be similar (depth, duration and deco loading) to the dives you've done on OC trimix? Yes, confidently
Will you be diving with another diver who has knowledge of CCR buddy procedures, or preferably is on CCR themselves? Yes
Will you be diving the unit in a configuration that you have dived shallower (amount of additional kit carried)? Yes, I have tried it with 3 cylinders

If you can answer "Yes" to all these questions, then I'd be more confident doing the dive on CCR, if you have a "No" or two, then I'd seriously think about doing it on OC, and spend some time over the winter developing those skills.