Nothing is impossible. You just need to know HOW-TO-DO-IT. If the multiplayer system can be repointed AND hex edited, that would be possible. The game already has data for 2v2 battles, and multiplayer movement, they can be edited to fit the requirements. However, all other things need to be synced, which would probably piss everyone off before finishing. It is brutal to do, but is possible.
TL;DR : Base Hex Editing.