The way I find them is to go to the gal map, in the search box, plug in the sector name and then the following AA-A H (ex. Wregoe AA-A H), then hit the enter key, if there are any of those systems in that sector it will go to the first one, if you hit enter again, it will go to the next and so on, check what stars are located in each and you will find the WCO and WNC which denote Wolf Rayets. Sometimes they will also be BH or Herbig AE/BE, Class O, Class A Supergiants or even Large Class B stars. Some sectors may few or none AA-A H systems, you will find a lot towards the core.
I did that in the PHAA Free Sector and went to about 70 or so of them, all undiscovered, most were Wolf Rayets, a few double BHs and 10 or so Supergiants. There were even a couple double Wolf Rayets, and that sector was w/in 3k Lys from Colonia traveling towards Sag A. I was surprised that only a select few were discovered, the rest were pristine.
You won't find a lot near the bubble, and if there are any you can bet they have been visited already. And Phaa Free has been done, at least, most of them anyhow.