I think the right way to roll this out is to create a new party as an abstraction layer between the new proposed system and the existing system. Within the par

I think the right way to roll this out is to create a new party as an abstraction layer between the new proposed system and the existing system. Within the party, you can use whatever voting mechanism you like to set the agenda of the party and elect party leaders. If the mechanism is good enough, you ought to be able to attract enough members to win a standard legacy election.