JG,
No, I haven't. But wouldn't be surprised if it worked OK, depending on the diameter of the suppressor, though it might require some experimentation with the position.
Haven't tried that, either. I think it would take more effort to get the relatinship right, may need a cleaning rod for that.
I'm posting the picture of mine, being we mentioned it. Some may not have seen it. Same idea as yours.
It takes a longer bench, like the one I built for the tailgate of my pickup. Works pretty well. Gibralter drum throne makes a great BR seat. Deer corn in the truck, headed to the camp; picture was taken a few years ago.
DF