Use UDCX files. In other words, "Convert" the data connections to relative data connection files stored on your SharePoint site and change them when you go live. You may still need to reconnect data connections if the site of your form changes. As long as it's the same site, the relative UDCXs will work though and you can just go into the UDCX files using notepad and manually point them to the live data.
Patrick Halstead
Project Manager at Qdabra