I vaguely recall there being something in the Rules Cyclopedia about hiding components with a straight Sleight of Hand check. But then, my experience with the book is "I looked through it in the bookstore once".

If you can grab Bardic Music (or get your DM to waive the prereq), Disguise Spell from Complete Adventurer seems like a good fit. It mentions hiding your components in a performance, but I see nothing wrong with hiding them in the deranged rantings of a paranoid lunatic instead.