Great idea Mr. keg, there will be a few things required to bring it all together and I think it would be a wonderful thing to get the groups to work for a common cause.
Leadership? Where is it? Can the people with the type of smarts and balls needed for this sort of gig keep their heads down long enough not to get hammered by the various management goups.
A plan? This is a negotiation and there has to be a nice plan that has the redundancies that will be required if/when things turn weird. The plan needs to be solidly in the middle ground, not too militant or conservative with common goals that are workable and realistic.
Most importantly learn from history, keep it tight, address the divide before it occurs and be ready for whatever comes your way. You are in a powerful position make sure you stay that way by ensuring the people who need to be on side are, if you know what I mean.
Sorry if this comes across as industrial relations 101 but I'd like to see you people get this sorted.