twerppoet
iPad Fan
Oops! While EE is great for creating linear tutorials, I see no way to branch to desired content in it. Could it be used in conjunction with a kiosk app, all on the iPad — don't know. That may be possible with the newer iOS versions.
Good luck.
I considered suggesting the Explain Everything app, and even Doodle Cast Pro, but in the end both of these are limited to creating non-interactive video presentations. As you say, they could be used to make some of the content, but could not be used for an interactive presentation on their own.
Websites, on the other hand, are exactly for that kind of presentation. It's just that they require a fair amount of knowledge and more expensive tools to create (That last is not strictly true, but few web developers have the chops to create complex websites using nothing but a text editor. Not these days.)
I've bounced this around in my head some more, and come up with a couple other 'possible' solutions, but a web site style presentation still looks like the most promising, given the requirements.