Newbie OD question

Hi everyone, I have one OD Master in New York one Replica in Paris Both Xserves are running OSX server 10.4.11 The servers will no longer need to replicate to each others so I need to promote Paris to OD Master (possibly without loosing the accounts). One caveat is that every computer in Paris and New York was configured to use Mobile Homes. What's the best was to promote Paris wot OD Master without creating havoc with the mobile homes? I could do without Mobile Accounts moving forwards, but I'm not sure what to do on each specific mac in Paris... Thanks in advance for your help. Federico