If I understand this correctly, you are looking for a secure hold on a reg that can be freed in a moment to be dispatched or used without much effort. My suggestion is do what I do when cutting in a high voltage panel. I hold the new wires out of the way with cheap wire ties. They are not as good as the wire ties with a stainless clip insert, and will open or break with some effort depending on the size. If you find it's to hard you can experiment with the different sizes available.The cheap cable ties or ty-raps as they are called, are the ones usually found in Wal-mart, Lowes, Home Depot, etc. The ones you do not want to use are the ones from Thomas & Betts, those suckers are tough with the stainless insert. I believe the larger T & B ty-raps are the ones use as hand cuffs by law enforcement. If i am off tangent on my interpretation of your application, Sorry.