Search by Last Name in backend User Administration page

Hi,
In version 5.2 in the Users section of the backend, Users can only be searched on by their Username or Email address. One of our clients would like to be able to search for Users on their LastName.
There is an article that discusses how something like this might be acheived however I think it only works on "User" data, not "User Profile" data, so trying to filter on user "LastName" won't work.

Does anyone have any ideas on the best way to achieve this? If I were to create my own backend User List widget, would I be able to link each User directly to the built-in "Edit user" page?

Gavin.