How to search a user by its twitter screen_name? (Since Twitter integration was never fixed)

The existing Twitter integration puts the actual ‘username’ into the ‘screen_name’ field on a user profile. I saw posts reporting this behavior a long time ago but it was never fixed.

How can I search for a user using Lucene syntax by its ‘screen_name’ property?

The current username search would require me to know the numeric twitter ID for every user which kind of defeats the purpose of searching in the first place.