I'll stick with your rules, and figure out how long of a festival it'd be after I'm done...
miRthkon
Thinking Plague
Present
Univers Zero
Aranis
Ruins (preferably Sax Ruins, unless Yoshi finds another bassist)
Koenjihyakkei
Hella/Zach Hill
Melt-Banana
Battles
Knifeworld
William D. Drake
Fred Frith (any of his groups, I guess)
Humble Grumble
Dave Willey/Hamster Theatre
Magma
Mats/Morgan Band
Dave Kerman/5uu's
Alamaailman Vasarat
Altered States (I think they're still active?)
Animals As Leaders
Korekyojinn/The World Heritage (Yoshida would be pretty busy at this festival)
Claudia Quintet
Charts and Maps
Damo Suzuki
Devin Townsend
I could list more, but then I'd end up with a month long festival.