Blogs Directory + BuddyPress Fields

I need help creating a mod for Blogs Directory + BuddyPress Profile Fields

Problem: Blogs directory is not easily searchable. Visitors to my site would like to view blogs by category.

Solution: New bloggers in my network add BuddyPress profile fields specifying their blogs' categories (often more than one category). I would like to add a dropdown menu or tag cloud to the Blogs Directory's front-end that displays blogs by this profile field (a multi-select box with ID of group_id=1&field_id=2)

Profile fields are located under Users > Profile Fields <-- a reminder to myself

Thanks,
Chris