How about the following ... (off the top of my head)
At some future event we start with one (or more) cash table(s) ... stakes to be decided ... (max re-buys to be decided)
The cash table could be open to all - if too many players then starting players by lots.
(Or have some qualifying events on 888?)
Players can leave if they want at any time, but otherwise players are periodically introduced from a waiting list.
Table review every say 60 mins, with the two players who have lost the most in the previous session replaced (though they can rejoin the waiting list).
Players are rated by net profit ...
Thoughts?
L