I wonder if putting up a pledge level limited to 100 people at a high enough amount to make it worth while is possible. Add the caveat that the dice would only happen if all the slots get filled. Then if they do fill up open another one for the next 100 people. Does kickstarter support that?
The folks at RPG Geek have put up a post asking for their readers to help EN World.
http://rpggeek.com/thread/918228/en-world-rebuilding-after-the-breach
Cheers!