The Noveske uppers that I’ve dealt with have included a BCG as well as a BCM Gunfighter charging handle. You should be fine.
The fact that John ships complete and nicely spec’d uppers is just another reason why you won’t see Noveske BCGs floating around these days. They keep their stuff for rifle and upper orders FIRST.
Chances are you wouldnt be able to get a bcg from the machine company that makes their bcg. The machine shop will make them to the desired specs of their customers. So, if machine shop A makes bcg’s for Noveske, Huldra and Spikes they may not all be the same.
I have 2 noveske bolt and carriers in my builds that had Noveske barrels, uppers, and lowers. They are not marked and they always have a donut around the extractor spring, which I find unusual. follow the advice and just get a good one.