Custom Sidebar on Pages

I know there is a lot of widgets for this but I’m wondering if anyone can suggest a good solution to what I am looking for.

I have around 20-30 pages, each has a sidebar that requires content unique to that page. This is:

• Youtube videos
• Gallery
• Related articles/pages
• downloads

Unfortunately, WordPress has a static sidebar, that is the same on every page and the custom sidebar widgets I have looked at require a lot of navigation in the dashboard to set it up per a page. It’s too time consuming.

Ideally, I’d like a way of editing the sidebar in the edit page screen.

Has anyone got any ideas of how to achieve what I am after? If not by editing it in the page, a plugin that would help me?

Thanks in advance,
Nick.