I have known individuals to use TrailBoss powder in a smoke pole.
That could be true, but you don't simply interchange equal amounts of smokeless with black powder. I knew some guys that did that. Started reloading with a 1st Generation .45 Colt. The first round they fired off blew the gun to pieces. Destroyed a very valuable firearm and put a guy in the hospital.The Ruger Old Army can handle smokeless loads...actually I converted a number of uberti 1873 ".44 Blackpowder only) cap & ball revolvers to shoot the .45 Colt and they've had ample amounts of ammo fired from them...including smokeless for the most part.
Other than as a curiosity I don't think a smokeless powder muzzle stuffer would have a purpose.