I guess what I was trying to say is that he ( a cop ) should be able to answer your question without being a d#ckhead. Sometimes certain people, who have knowlede about a particular subject, tend to make others feel like there is some alterior motive for wanting to change a firearm.
I kind of got the same responses from others when I wanted to purchase a kit to convert my Glock 17 into a carbine, and then back to a pistol again. Apparently, the law will not allow you to do this. Once it is converted into a carbine, it can't be "shortened" again.
I don't think you will be able to do this without going through the proper channels, and in the end, you may just come out better purchasing another Judge. I may be wrong though. Hopefully someone else will chime in.
Good Luck!