We can do it already can't we?:
a) David Tebb sets up an "I am DT" clan
b) Team captain sets up a "challenge DT" clan
c) Everyone who wants to beat DT registers with the "Challenge DT" clan
d) The captain sets up a clan match with DT, both clans set themselves to accept no more challenges
e) The challenge is played out - the challengers can use the "message clan members" feature for their discussion.
To be fair, the captain should be someone with a high rating so DT doesn't lose too many rating points
I think this should work... Anyone see any flaws?