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push pull cables have been used for manual transmissions for 3 decades. I think they hold up just fine.
for air you can rig up two cylinders to push in series. each with double throw (not spring return) energize both to pull and it goes into low, energize both to push and it goes into high...
push pull cable all the way - that or pneumatics/hydraulics (two cylinders with the air bled from the system should give very consistent movement and just have to run a hose or two)
PS. good to see you post again - I've been wondering how this project was coming along since I still am hunting...
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