Another update! This is actually possible to do with a macro. You can get a list of all members that have a specific account level (complete with the arrow buttons to browse if there are too many to fit on one page) by putting this macro inside of a "raw" block:

{ {~bx_persons:browse_by_acl[...]~} }

Take out the spaces between { { and } } to make the macro work. Also "..." needs to be replaced with a number, which is the ID of the membership level. I had to find mine by experimenting with a test page - I just tried all numbers from 1-9 until I found the correct membership level.