If you do any sort of dance, choreograph the heck out of it. Even though you're supposed to be clumsy in the skit, if you don't practice, your clumsiness might look really sloppy.
Also, keeping it short is key. Most audience members get bored if a skit lasts much longer than a minute. Don't forget to make sure the cursing is okay with con staff beforehand, since some cons have a lot of children that attend.
But it does sound funny, original, and understandable for people who aren't Black Butler fans, which is fantastic! Good luck!