Double barrel pistol is about 53oz loaded (both barrels loaded with 1/2oz).
I guess the selector could be modified to shoot both at the same time.
Heavy loads over time might be too much for the little pistol.
I don't see normal loads having to much "hurt". A one oz ball/slug with 60gr T7 might be a little stiff.
"The maximum recommended payload is 1 oz. of shot, and 60
grains of ffg black powder using standard #209 shotgun primers"Unburnt powder coming out the 6" barrel would add to the wow factor

The 8" RedHawk is about 58oz loaded,
My Girsan 1911 is about 47oz loaded,
the 1858 is light at about 38oz loaded.
Major PF in a gun "around" 50 oz should be manageable, even by a girl

Pricing seems to be a little high though.
I agree, PF of 228 out of a 28 ounce Springfield XDM 3.8" Compact would be brutal after a few mags.