Ken
I have a couple of friends who run a stroud CO2 chute launcher basically the cylinder takes the place of the launch spring. They have it plumbed to be pressurized when ever the CO2 bottle is turned on.
You may have to bleed it down to repack the chute.perhaps that's the purpose of the toggle valve?
they still use a Cable to keep the pack shut and release the chute(s)
Packing the stroud with three shroud lines and putting it In the bag is a little odd at first but they do work well.
Hope this helps