OP you’re sorting of missing the point of wild camping. Get a map and go and explore, there are loads of options around that area. At this time of year midges and ticks can be a major issue, so unless it was very windy I’d be looking for somewhere a bit exposed and without too much vegetation to harbour ticks. As others have said, Glen Nevis is a good place to start (it’s not really near Nevis Range) but be aware it will probably be quite sheltered and with near fatal levels of midges and ticks. Anywhere near the car parks is also likely to be full of camping neds, who also might kill you.
I would heartily recommend Glen Nevis campsite. It’s within walking distance of a pub, where you can shelter from the midges.