Even selling out a member of JP won't get you kicked off, so long as you don't do it through (or using) info on JP. For example, Clockwork is still on board, despite repeated attempts to sell Netcat out.
It seems certain that Riser is dead, but we just have a third-hand account. Remember, especially in a world of magic, bodysnatching AIs, e-ghosts, and shedim, anything may be possible.