I've got clubmans on my 550, as well as the stock cables. I replaced my clutch with a stock replacement as mine was stretched beyond belief. It feels fine after I adjusted the slack. Throttle cables are a little tight, but routing was different.
The biggest difference is the main loop at the front. The way I set it up the metal necks that come's out of the switch pod point to about the 10 o'clock postion. So the cables loop out and back from there, going to the right side of the headlight bucket, and then to the left side of the neck of the frame. If I were a smart man, I'd have measured the rise of the stock bars from the triple, then measure the drop of the clubmans from this. Subtract the total from the stock cable's length and there you go.
I'd give yourself some extra slack for wriggle room with the routing.
EDIT - Now that I think about it, that would probably leave you short. Your way is better.