More seriously there is a number of ways of doing this. I would imagine the simplest would be to create a trust and have everyone give their equity and options to the trust.
The bigger issue is how to ensure that people don't game the system. The assets being put into the pool need to be accurately valued so people don't put in what they know are worthless assets. Of course there is there is the reverse situation where those already in the pool undervalue new assets.
Most of the effort of this idea needs to go into setting up the rules so that everyone does the right things and everyones interests are aligned. While I think this might be hard, I don't see anything that can't be solved by some smart people.