I haven't done this with a stock clutch, but from a reliability & maintainability engineering perspective, I'd suggest that switching out to a concentric hydraulic throw-out-bearing would do more harm than good.
First, you would be moving the functionality of the clutch slave cylinder inside the bell housing, so when it fails, you'll have to pull the tranny to fix it. What about hydraulic bleeding - how would you get to the bleeder screw without pulling the tranny?
Second, if the failure of clutch fork and/or pivot ball on FCs really happens frequently enough, it would be a lot easier to just design beefier replacement parts to solve the issue.
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