Hi Jasper,
Thanks for the reply. I think the implementation is fairly straightforward. Basically, when entering a URL for the button, Buttonizer is looking for an absolute URL and does not process shortcodes.
As an example of how I would use this feature, instead of entering;
https://mysite.com/page-url
I would enter
[siteurl]/page-url
My shortcode is returning the current multisite blog for the user.
Thanks for the consideration.
Daniel