My best suggestion would be to gift your friend a set of hand-made wall hooks: drop some silver solder down the barrel, heat the barrel pretty good, and hang that thing on the wall.
My first experience with muzzleloaders was with a friend's dad's old .45 CVA/Jukar: it shot well, with no apparent issues, over a long 8-9 hours at the range; took it home and cleaned it thoroughly, and he put it back in the safe.
His next session with it, he ran a couple cleaning patches down the barrel, loaded 'er up and touched it off... and was a little surprised to see powder smoke issuing from out of the barrel channel, just in front of the rear lug mortise.
Closer inspection revealed the lug mortise had been cut to within a few thousandths of breaking into the barrel; time, use, and a lot of cleanings had eventually caused the barrel to rust through from the outside, under that pin lug's base.
A thousand or two bucks for a good benchmade repro might sound expensive right off the bat, but it's one heckuva lot cheaper than reconstructive surgery.