Rick, I am sure a double set could be made, but it will have to be 100% hand made and will take you some time. The way a Mosin works, the basic principals of the double set triggers from 1920s Mauser sporters could be used I am sure, but the scale will have to change to fit. Also I would recommend setting the rear stretcher and the front trigger fairly close together. Another option would be a single set made in the way CZ does theirs, where you would have to push forward to set.

I am almost finished with this one. I am thinking about the options of carving the stock, or checkering it. (maybe both, with a carved border and checkering inside.
I also am going to engrave it on the sides of the magazine and some coverage on the receiver, but I have to get the time between the "paying projects"