[DanEC]

Each clutch as you have found out is a little different and bent finger diaphragm clutches are the most so. To really find out the answer to your question accurately, I would assemble your flywheel and clutch on the bench, put in in a hydraulic press with the TO bearing on top or some piece of heavy metal to represent the TO bearing. Then mount a dial indicator on the bearing and measure how much the clutch has to be cycled to get an average of .030 gap between the disc and flywheel measured with a feeler gage. The press will probably have to cycle the clutch a little less than 1/2”.

It seems that most slave cylinders have about .9 to 1” stroke. A lot of clutch forks behave around a 2:1 lever ratio but that might vary with different manufactures. I would assume most internal slaves must be able to stroke around 1/2” without problem.