I don't know if its possible, but I would recommend the following in order to give the promised 2 weeks.

Can you start the headstart on the old servers (if issues of data saves and lag issues are fixed), and port the data over to the new servers when they arrive. It will probably be a headache when the server has to go down for the switcharoo, but at least we will be playing.

Your consideration would be most appreciated.

Like I said, I don't know if its possible, but if it is.....