runas – Display Username in window title bar

I’m doing a lot of runas at work (multiple accounts, poorly managed, but I have no choice). What I’m looking for is some way (don’t think there’s a windows feature, but that or a add-in would both work) to display the user a window is running as in the title bar? Like I often have 2 SSMS windows open, and no easy way to see which is which.