Let's throw some more beans in the pot.
If you like the size of the 49 pocket revolver, Colt (and now some of the Italians) made a 36 caliber variant of the 49. It carried 5 shots and was built on the 49 frame. Uberti makes a fairly good copy, they call it the 1862. It can be had with either an octagon or round barrel, just like Colt made them.
Some other company makes an 1862 with 6 holes in the cylinder, on the 1851 frame. Yeah, a short barreled 1851 or 1861.
So now you can find a pocket revolver for your shoulder holster in navy caliber to match your belt gun.
Most of the mail order or online stores can get either one.
Why not just a second belt gun?