Keep in mind that, besides the High Concept, you have your Trouble and five other Aspects to work with. Granted, the last three are going to be tied to your Story and your Guest Appearances, but that still gives you three other Aspects which can incorporate parts of your idea.
I'd suggest breaking things down a little. The High Concept should be your character's central motivation/self-image. Other elements can come from your character's Background, Rising Conflict, or even from your Story.