I use conventional cable releases. I came across one years ago that is metal clad and has a set screw type of retainer that has stayed with me really well. Have never come across another of that type. (Figures that the company made them well and had no replacement sales).
I will be doing the pneumatic type, as well, fairly soon. I just bought a 610 mm Apo Nikor (process lens) that I will be mounting on a Deardorf board (I hope) and will be using a Packard Shutter. I think that if I had known the size of this thing I would have passed. Definitely not a back packers lens. The rear flange is about 5 1/2 inches across and my 'dorf boards are 6" so not a lot of room to play with.