So I made a module
It adds a new toolbar button on the wysiwyg/html editor in the admin.
It's implemented as a behavior that loads a custom tinymce plugin. Once added to the controller the button can then be added to the list of button on the field.
It's available to download from github: https://github.com/d.../ls-filebrowser
See the readme for more information.
It's not 100% tested so use at your own risk
Cheers
Ben

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