I thought the proper shortening for the Ottawa Senators was the "Sucks."Your attempts at mental, moral gymnastics while somewhat impressive are hardly convincing. The "klan" is simply a short form of Ku Klux Klan, another proper noun. Therefore using proper grammar, the "k" is capitilized as it clearly identifies that particular group as well as being part of its name. For example, when you short form the Ottawa Senators to the "Sens" in writing, you still capitilize the "s".
Strike 2 for you.
Either set of Ottawa Senators.