I came up with a brilliant plan to move the rear rim (17x2.50) to the front and lace a 17x3.50 to the rear. As it turns out, the holes in the rim are drilled at very specific angles so if the rim is made for a fat hub that contains drum brakes (like the NX rear hub) it will not lace up to a normal hub (like the front hub). So I ended up buying a CARC front rim for the bike. I like the rim, it trued up very evenly.
The 17” front rim drops the front end 2”. I also owned an XR650L at the time. The XRL’s front suspension
happens to be 2” taller than the NX’s. So I swapped the two front ends. Then I put a rear lower link in the XRL to correct the geometry and I sold the bike. At first I felt kind of crappy selling a bike with downgraded suspension, but as it turns out there are a lot of people who want a shorter XR650L. The front suspension on the NX is now great for trails (although the sumo tires aren't that hot in mud or sand).
If you want to do this fork conversion on your NX you'll need the forks, triple trees, axle, speedo drive, speedo cable, wheel spacer, bearings, and brake caliper from the XRL. You'll need to do a little grinding so the ignition switch won't rub, but otherwise it bolts right in. The steering lock will no longer line up, but that's not a big loss. The biggest thing to consider is that these forks are 2" longer than the NX's. To fix the geometry issue you can do a supermoto conversion or put a taller shock in the back to jack it up to match. If you did nothing with the back it would not be a big deal. The longer front forks would give you more trail, and therefore more high-speed stability, but the bike would not corner as sharp at low speeds.