It would be a wonderful idea, even though I'd stick more to a spin-off game, like using Hans and seeing what he did and experienced before meeting with Kate.
I have some knowledge of C/C++ and somewhat worked with SDL years ago... I know Java too.
But well, this would be such a big job, which requires much time, much skill and many people. Backdrops, sprites, music, screenplay, dialogs, testing and so on... I sincerely don't believe it would come to an end easily
See all the fangames like unofficial Broken Sword 2.5 or King's Quest IX or Indiana Jones and Fountain of Youth... they've taken
years of hard work and still we ain't got nothing but small demos.
Also, using Flash or Adventure Game Studio could facilitate lots of things, but I couldn't contribute since I'm using Linux and neither Flash nor AGS are available for Linux.
This is one of the dream-like things that usually require too much resources to become concrete, beyond MC2's copyrights and other legal issues possibly involved.