I regret I don't know if any US hand-made guys do them regularly, but I bet if you approach one and make a request for a custom with a military mount the story would have a happy ending.
Savinelli makes them too, and I have several in the Punto Oro line. Ashton has, but I don't know if current production includes them. Nording makes some as well.
Otherwise you might look for "spigots" as well. A spigot mount pipe is a military mount with the stem end capped in silver to match the domed cap on the shank. Very very pretty, and also usually more expensive than straight up military mount beauty.
I love those army mounts!