It would be interesting if 7...c5 were playable.  Maybe it's not the huge mistake that some sources indicate (Ward's Unconventional Samisch King's Indian gives 7...c5?? 8.e5!), but at least 7...c5?!, I'd think.  If there are some serious new ideas for compensation (perhaps that incredible rook sac line?), I'm not aware of them.

There is always the possibility with these lesser-played lines (6...b6) that one or both players forgot their theory and overlooked 8.e5!.  Perhaps Black forgot that he shouldn't play 7...c5? and White chickened out, fearing some kind of prepared line--it happens, even at fairly high levels.

On the other hand, there have been a few games where strong players have played into this (maybe by accident?), and it actually seems that Black gets a lot of compensation if White grabs the rook.  I highly doubt it's entirely sound, but for a surprise weapon over-the-board, perhaps it's worth a shot: