The TD's are not responsible for brainstorming, just whether your tournament is valid. The other players here will help to some degree, but my experience with new innovative tournaments is that they take some time to plan and sometimes are not possible. Having teammates attack teammates is just a bad idea, sorry. My current Deadly Vipers Tournament
took several months to plan and I got clearance on the attempts rule. It has a number of new or rarely used features, maybe you can get some inspiration from it.
I have yet to figure out a way to get multiplayer games into a 2-clan challenge that doesn't break the Secret Diplomacy rule as there would be predefined teams, ie. clans Eg. Say you have 4 people designated as a team on a terminator team. Players 1,3,5,7 from one clan and 2,4,6,8 from the other. This breaks the Secret Dimplomacy rule. One of several ideas I had to abandon.
As for "wording", your first post still doesn't specifically say that the spy will be expected to attack his teammates.
As for ideas:
What if the spy only gave information? Eg. Each round Team 2 asks the spy on team 1, a question like, does player 1 hold the O bonus on Classic shapes? The spy then has to answer. This may be tedious to do via pm, and not sure how you would monitor or ensure the spy answers in a timely basis.