http://www.chess.com/groups/home/gruumlnfeld-and-the-kid
There is already a group for the KID, and I assume you could discuss the KIA there as well. I was thinking of creating a group on the Pirc/Philidor. Would you like to work with me on that one? We could use both openings as a focus for the group...
I just can't see a very large following for only the KIA, but I think the group would gladly accept those opening themes into their group.
While we're at it, we might as well make a hypermodern group with Pirc, KIA, and KID.