I'm more than willing to admit that I'm probably making this far more complicated than it needs to be. Here is what I want to accomplish. Maybe someone can point me in the right direction please please oh please!

I have a custom page layout for a publishing site. It's one of a handful of custom layouts that I've made available to our users. On this particular one, when the page is in edit mode I want to have a textbox show up (along with the standard title and page text fields) where they can enter a YouTube video id or url. Once the page is checked in and/or published, the layout will take that video id or url and render the video into the header.

I hate to say it but my users aren't the sharpest peanuts in the turd and anything more complicated than this can and has caused issues. Even lists are a bit beyond their grasp. Web parts have proved absolutely disastrous in the past no matter how much documentation. I don't want to the be one constantly updating their pages with new YouTube videos for their departments so it needs to be about this simple (or simpler) in order for them to comprehend it.

If it's a programming solution on my end, I'm perfectly ok with that, mind you. Any thoughts?