XCR remote switch
Mountain High makes a remote On/off switch attached to a flow meter and in/out air lines with their XCR portable unit, that you wear on your arm/leg with straps, while mounting your cylinder out of arms reach. You should be able to buy that component alone. I am thinking about that for my RV4 presently because of the mounting limitations. You still need to open the regulator before flight (and close it after flight) but it conserves oxygen until ready for use, thus increasing time between refills. It came from the glider world I've heard.
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