I changed to the RJM master with the stock csc. No issues. I eventually replaced it when i did the clutch but if you read the description about the RJM master, it's supposed to save the csc by not over pressuring it.
Not sure I'd call that a good mechanic if he's refusing work unless you pay for a bigger job. He can give you the pros/cons then ask if you still want to proceed.
Bottom line, what ever you decide the RJM master is a tremendous improvement.
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PW 07 HR350Z R.I.P. Totaled by 82yr old woman 
2010 40th Anniversary 370Z
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