I know people who do go out in Camberwell. To that Funky Monkey place (which always seems to be rammed) and to the Sun & Doves for instance. Incidentally, the Sun & Doves is kind of a foodie pub in Camberwell.
So I think you could probably make Redstar work. If you look at Herne Hill, there's the Florence and the Prince Regent, which both are doing well (both very big too). And the Herne Hill Half Moon is having a bit of a renaissance as a music venue –*they've got Handsome Family playing there this month for instance.
And that Ivan's Retreat place in Brixton seems to have pulled itself back from the brink, thanks to a simple fliering campaign: there was nobody in it ever until about a month ago, after it posted little leaflets through hundreds of doors, marketing it as having a bit of a "Big Chill Festival" type vibe. Mind you, the decor in Ivan's Retreat is shocking - they really shot themselves in the foot painting it so dark.