Perhaps your joking but this is something I've seriously considered doing. Maybe rig the pole straps to allow for only a certain distance apart. I'm a major card dealer too.
Was kind of joking, but I need to do something. I have noticed that this year, after running laps in the bumps, my right shoulder is very sore- almost like a rotator cuff thing in terms of pain raising it above a certain point. I had shoulder issues many years ago (non-skiing related), but nothing recently until trying to really get back into bump skiing. I think it is from late plants where my arm is wrenched up and behind me (gets to the point where I can't reach back for the safety bar without agony-the obvious answer is to reach back with the other arm, I know!).
If you have also considered it, maybe I shouldn't be joking. If I have some time over the holidays I may try and craft something togethor. Probably will end up injuring myself trying to use it...but hey.