I was in that area in May, or June, can't remember, and had a superb time. This incomplete blog post may be of some use (or not, as so far it only describes two stays in bothies - which I would totally recommend by the way).
https://summitstupid.com/2016/06/05/a-week-in-the-highlands-part-one/As for a Munro camp - the hills are pretty spiky round there but one that I would guarantee would be a great place to camp is Ben a' Chrulaiste, just opposite Buaichaille Etive Mor. Not a Munro (Corbett, I think) Great big grassy plateau on which to pitch, and utterly astonishingly super-duper and extensive views, most notably of the Bookle itself. Seriously, if you got the weather that would be an amazing place to wake up.
Don't recall seeing much forest in the area that you could camp in, maybe Glen Etive would be best for that sort of thing? I camped in the woods behind the Kingshouse Hotel but not sure that counts...
Oh, I know where has some good inspiration for this area:
http://v-g.me.uk/TripsPhotos/TripsPhotosArea.htmThose good old V-G Hikers! The three most recent trips in the Scotland section all pertain to the area, including Rannoch Moor, Glen Etive and Ben Alder.
Hope this is of some use.