What are you wanting to adjust, crank arm length or virtual #teeth?
If adjusting crank arm length, we should get a mechanical engineer to see how much of a difference this would make compared to Rotor Q-ring?
Great idea for a study!

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Bike Fit Educator
Peaks Coaching Group ELITE Coach
Certified Power Based Trainer
Certified USAC Skills Instructor & BRP Instructor

I have been thinking about this for a while, talked to an engineer but he thought that to fit a hydraulic system that could withstand the force from pedaling in as much space as there is now in the adjustable crankset like the one that sits on retul, guru or purely custom fit bikes is too small.

Jeroen

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Owner at TRIPRO, The Netherlands