I'm rarely the pitch recipient, but I'd be interested to know how people would respond if you carried a video of your pitch on your phone. Sure, you'd have to iterate it a lot, and that's trickier with a video, but it might enable you to deliver the initial message clearly.
The other idea that comes to mind is . . . what about an interpreter? Could you go to events with a friend (or, ideally, a cofounder) who you can communicate with, who can then relay that information effectively?