Spent way more time reading this when I should have been sleeping this weekend, it's just that good!
I was wondering if you had considered having Harry and the ladys cook up something nice for Dumbles head? Say for instance, a bi or trinary potion that when all parts are ingested interacts in a way very similar to LSD or even better PCP. Could have the cards lace his shampoo with one part, his clothes with a contact version of the second part, and his food with the third. Then arrange some chaos that he must be present for in a very public place, and let things take their course. I imagine a bad trip in the middle of a public speech would do some damage to his credibility, especially if its before the ICW.