So!
The Liberace and Liza show currently running at the Harold Pinter theatre has "Liza" (Jillian Snow) opening the second half with Losing my mind with Libby (David Saffert) on the keys and live backing band. It's worth the price of admission money to see this (!). Seriously if you like or love Liza or just fancy a trip out, buy a ticket!
I discovered too late that the real Liza had written (maybe with assistance from Michael Feinstein) the script for the Liza at 80 tribute at Carnegie Hall. Up pops Losing my mind again announced as a version Liza hadn't had approved by Stephen Sondheim. Camptastic and a nod to the PSB arrangement too.
Replying to my own post but it'll bump this up for a while.
The Liberace and Liza show also has a bit of a throwaway joke about ''Rent'' where Liberace starts an intro and asks Liza to guess the song which is obviously not ''Rent'' but that's her guess.
The current Broadway and West End Paly ''Oh Mary'' has Liza's recording of Losing my mind played over the theatre speakers just before the start of the show!