Zuck is absolutely a better presentation speaker than Elon. I don't know how you calculate charisma but Elon is a great leader despite his inability to give an presentation that is interesting vocally.
One thing I always tell people like you is: concentrate on your content. Anticipate every possible question, and have an answer for it. Don't think about hand gestures, eye contact, and all that Toastmasters stuff at all.
Have little note cards with reminders to yourself on what points to hit.
You can only think of ONE thing while you're talking. So let it be this:
I know the stuff.
They don't.
They want to know it.
Maybe that's three things.
"hope that some people will still listen" : Yes, they will, If those three things are true.
I definitely fine myself more engaged by Elon's presentations despite his performance.
I'm not sure if that counts as charisma, but it's not nothing.