Yeah, I've seen a lot of great talks on youtube (there's a ton out there), but as far as real get-started-with-x talks, I can't remember any that really stick out as good examples (I'm sure I've seen some, just can't remember). I remember when the developer in that video implemented the reverse-time feature it was really impressive to watch.
Your talk seems like it might be split between two topics; introduction to android at large, and why use kotlin over the other choices... It might be a little hard to balance both but.
Also, I think I might have mentioned, but the safe way to go with demos is probably to record the parts before hand, then attempt the demo live, and maybe fall back to the recorded part if things go awry.
I think I'm leaning more against doing a live demo at this point, but I may change my mind as I continue working on my demo material.
Good advice on the slide suggestions. I'll definitely want to cover the Java alternatives on Android and why I prefer Kotlin.