I think the "rules" as it stands give the trustees the ability to remove any member that they feel is disruptive or not good for the project. They don't need to provide a reason or justification. It is at their discretion. So disruptive people can be removed. If I am misunderstanding this, let me know.
I understand what you are getting at though, but to make it sound better I would take a positive stance, and list expectations in the Code of Conduct. I'll will give you an example:
"Foundation members are expected to act in good faith to cooperate with others and resolve problems constructively, including the use of our official channels for dispute resolution. The Foundation reserves the right to remove anyone's membership who they feel is being disruptive to the project or not acting in the spirit of cooperation, and depending on the severity of the behavior, this may not even include a warning. Therefore, it is important that as a Foundation member that you are aware of this. We expect that you will not only cooperate but act in a way that models professionalism and respect -- that is our standard."
That's a friendly warning, and if people read it, I think they will feel "Cool - the Foundation is trying to maintain a professional environment. I can get behind that. And I know that they expect that from me and if I deviate from that, I know what the consequences might be." Then I really don't feel like the Trustees have any hoops they need to jump through to remove people -- they can exercise their rights as described in the bylaws.
-Daniel