Directory listing by Pro Site level

I would like the output of this plugin to show categories of sites based upon the defined Pro Site levels. I want to be able to have the directory list show the top level sites first; e.g.,:

Top Level Sites
- top level site 1
- top level site 2
Second Level Sites
- second level site 1
- second level site 2
etc.

My thought is that this would be great as a shortcode that would allow you to choose what to show (e.g., only show the Second Level sites) and where to embed it.

This would also allow you to offer a user the ability to filter what they are seeing, i.e., I only want to see the "X level" sites.

Has anyone done anything like this? Or, know if it is possible?
(I'm not a PHP programmer so please be kind!)

Thanks

John H.