In this article we introduced a small add-on to work face maps, and explained why such an add on is needed in Blender 4.0 and later.
Recently contributor Yann submitted a pull request that adds a nice, dedicated panel to manage any number of face maps. This offers an way to interact with face maps that is similar to how you would work with vertex groups.
I removed the now redundant entries in the select menu because I don´t want to clutter the interface more than needed.
The new version of the add on can be downloaded from Github. Simply click on the "download raw file" button (near the top right) and the install the file as an add-on in the usual manner.