I didn't read all the post in your article so I might have missed something but my present MultiCoin does support P2P multisign escrow.  but at this time I can't get the Bitcoin group to be a part of it.  I am already testing it in the weeds proto test chain and will fully implement escrow in beertokens when we have decided on a security model of the new block chain.  I think that is what would be needed to start using your dirivitive escrow contract as I might now call it.  You can see more details about my escrow features in my article at: http://forum.bitcoin.org/index.php?topic=24209.0  and as I see you are also looking at models of new possible currency control method what better way than to control your own in a smaller group of more trusted friends or group you have more faith in than a government.  I see the future of a fractionating currency flood that will have to be controled by a group of people not by algorithms in a program that we can't predict the outcome of.  contracts with asset backing will also help to stablelize as long as the assets are in place to support the outcome.