Because of the design, the cartridge has to be very short, even shorter than the .22 Short. Could such a gun be made for .22 Short? Sure, but the diameter of the pistol is limited by the size of the hand, so anything much longer would not be practical. Conversion of an old one to use .22 Short would not be feasible and would destroy an antique. Further it would require cutting the front off the bullet to get it to fit, so factory ammo would not work.
I am afraid this is one of those many antique guns that will NOT be reproduced any time soon.
Jim