No campsites, or nice ones I'd stay at after leaving BH till Wolseley.

You can get there in one good day OK. For what it's worth the Ivy Falls Island campsite is actually outside the park, and heavily used anyway. Worth a look and fishy if you feel like visiting. The whole area around 3-Mile and Wolseley is used by the outfitters & guides on LLC. There's access to 3-Mile from a connecting lake to the southwest next to a road. So you'll see canoes and boats stashed in the area. Don't get me wrong though, it's an interesting area and a fun travel day.

Jimbo's right about Bearpelt Ck. Once you start up it you should expect solitude. Lots of logging artifacts along the creek all the way to Badwater. Try to spend some time on Omeme and Badwater. Both have some nice campsites and fishing. If you didn't get enough exploring and feel like you've got the time exit from Badwater thru Robin. Not much for group camping that I remember along that route (BW-R). I've solo camped on Robin, but it's not a very big site.