Most public speaking audiences don’t expect you to do a crab walk across the stage or flap your arms wildly like a chicken. Why would they? Such behavior is uncommon.
This is exactly why you should use a funny walk or an odd body angle in your public speaking engagement. Stand-up comics from Steve Martin to Charlie Chaplin have been using this technique for years, leaving audiences in tears (happy ones).
Normally I’d forbid it, but now is your once and only chance to use a mirror to create a public speaking movement or angle that works for you. Go ahead, practice in front of the mirror; I won’t look.