I know that it's a bit of a sacrilege since 18-inch (there even is a very cheap MC18 MAGTEK rear wheel listed on a site here) wheels are a part of the NSR DNA, but I want to use modern rubber and from what I have been looking at, CBR wheels from the same era should be a pretty easy fit with some light machining, since IIRC all of them use the same cush drive part at least. IIRC, the rear brake disc diameters are all the same, and, from my testing, the CBR also uses the same caliper mounts between generations. MC17 wheel is pretty much a direct bolt-on replacement, and the MC19 wheel fits with some light machining if you can find the plates from the MC21, pretty sure that the same applies to MC22 if you want the MC18 design.

https://sames505.blog.fc2.com/blog-entry-316.html?sp

As for where I'm going with my, I'm already changing the front to an MC22 wheel since I decided against using the MC16's axle-mounted speedo drive. This removes the brake disc problem, since then I can get smaller spacers machined to fit 80mm PCD Yamaha 320mm discs for the GSX-R forks, and I can re-use the non-standard 22mm ID 6004 bearings that I already bought to fit the R1 axle. So the rear will probably be changed to match it.

But that ND5 swingarm is a major headache for me. From the pictures I have seen, it didn't use any cush drive, so the wheel ends up not being centered if you mount the MC17 wheel with the cush drive, I was able to get it centered by removing one of the bushings, but still not sure about it. There will need to be some work done over there. Also, the axle needed is ridiculously long, longer than any that I have come across yet (300mm IIRC)