It doesn't look like it is going to happen. I have the 228, 229 and NP-34, so this is an issue of interest to me as well.
I believe that, for awhile, Questar had the 229 conversion kits listed on their website, saying that their availability would be subject to whether they could get them with a long enough barrel (to avoid the barrel falling within the definition of "prohibited device"). They still have this kind of message up there for the 229 X-change kits (convert .22 to full calibre).
Now they just list 220 and 226 .22 kits on their site, and if Questar isn't going to bring them in, you can pretty much take it to the bank that no one else is going to bring them in.
https://shopquestar.com/shopping65/shopdisplayproducts.asp?id=222&cat=.22LR+Rimfire+Conversion+Kit
They do have the 229 "Classic .22" complete guns, and they appear to have not sold very well, as they still have quite a few. Inability to use the "X-change" feature and some questionable reports on reliability seem to have affected the desirability of these. I was going to buy one myself, but backed off of that when the reviews started coming in.
https://shopquestar.com/shopping65/shopexd.asp?id=553&bc=no
The other issue for you is, with the 229 kits, I have not heard of people having a lot of success putting the 226 .22LR kits on their Norc 226's. Some people may have gotten it to work, I don't know, but definately some people have bought the kits and had to sell them because they simply didn't work with their Norc.
I would look elsewhere for a .22.
Speaking of which, About time for Norc to tool up some different .22 pistols?