Sparky,
I think you need to sit down and think about what you are trying to do.
A drag racing clutch is generally set up to slip coming off the line with centrifugal weights to effect lockup of the clutch at high rpm.
This is almost the inverse of what you want.
You want a clutch that slips at a torque level above your maximum nominal output torque but below a level that would damage the driveline. This is not rpm dependant. Centrifugal control is not workable. You are asking the clutch to pass your maximum torque, and then at a shift point, magically slip at any marginally higher torque (which would be induced by inertial effects at essentially the same, or lower, rpm).
All you need is an adjustable preload clutch that behaves very well. And, once slipping doesn’t just keep on slipping and overheating and wearing out and becoming an adjustment/maintenance headache.