Edit XML from WP for Flash

I am converting an existing static website into wordpress. I need help on 1 aspect.

The client has a single flash graphic that uses and XML file to load external content. Simple and common enough. EXCEPT! The client wants to be able to edit the flash graphic ( the XML ) on their own without diving into the code. So i need a interface that makes it easy to edit from WordPress itself. This seems like a common enough situation but can’t seem to find much, if any, support.

I did find:
XML Gallery
https://brunotnteixeira.wordpress.com/xml-gallery-wordpress-plugin/

This plugin in 75% of what I need but 1) It’s Buggy, and 2) I need to customize how the XML is displayed so that it can work with the flash.

This is the site I am working on.

https://healthyatnbcu.com/

It’s the top right banner.

Does anyone have any solutions? HELP!