Personally I find this a bit pointless considering how each Gensokyo build has different leaders. I.E. Eiburine is in charge of Chideren, Phantom is in charge of most of Subterranean Animism, and so on.
I think the biggest issue, from what I can see, would be the people who have poured years of effort into their cities, in which are still expanding and unfinished. But with that suggestion of world edits, porting, or some other proper re compensation, things might work out. Perhaps major cities like Sakura would be ported to creative, and modified to fit back into the new terrain.
In order for us to know the most convenient launch date for Project Echo, of course we'll need to know from everyone else in the community when the majority of people will be available.
Christmas break, Spring break? Or if anyone has plans for Christmas, please let me know.