I don't have the norvil fairing. Mine is more like the late dunstall fairing, probably copied by GFTP. The stock swing of my '70 commando with 2.25" offset yokes was too great, so my hands would bump into the fairing. I ended up doing many different things to make it all work the way I wanted it to work with almost flat bars. I didn't want clip on handlebars because I didn't want to ride in that forward position so I did a number of things to the fairing bracket...
1) I welded 2 pieces of bar stock steel onto the faceplate of the steering head bracket, so they pertruded downward in front of the steering lock tabs on the head stock. These bars shorten the swing of my yokes, and also make it so my fairing mount bracket cant rotate in place on the steering head. This keeps my hands from banging into the fairing.
2) I rolled my handlebars downward slightly (probably not applicable to you if you're using clip ons)
3) I completely reworked the headstock bracket because it was a single arm originally with a "T" angle iron at the end of the arm to fix the 2 fairing mount bolts. It seemed like it would be ok if I was racing and didn't have a headlight, but the single arm interfered with the headlight shell, so I cut the main arm off and made it into a forked bracket with 2 arms so the headlight shell fell between the forked arms. Now, I can see my headlight shell ammeter and reach the lighting control switch in the headlight shell.
*** I also made a second bracket to support the arms of the lower fairing which I mounted on the frame downtubes with rubberized "U" clamps, because the original design is a piece of flat metal connecting the lower arms to "where ever the feck" they mount, which doesn't support the fairing very well. It leaves most of the support to the headstock bracket. I found the whole original fairing mount system lacking in elegance of design and strength, so I mounted the original bracket then made measurements off that mounting to compute the alterations I needed to make... Although our fairings are different, you may need to use that same method to diagnose your fairing issues and make your necessary adjustments.
In the end, I have less yoke travel because of the steering stops I added, but it doesn't take too long of riding around to understand that tight turns at very slow speeds are tricky without that extra yoke travel. "K" turns in parking lots are particularly effected too. But, when you are riding around at speed, you don't turn the yokes all that much to turn the bike, even on the tightest of sweepers, so you get used to the shorter yoke travel.
The only thing I would warn you about is lending your bike to someone who isn't used to your diminished yoke travel. Chances are they will be ok at speed, but that loss of steering range can mess up their expectations at slow speeds when the yokes wont turn... HTH