I found a very rare WA visualization plugin last month, which is a default visualizer for NeroMIX and Nero Home. The "Bouncing Betty" preset on this visualization looks like the Nebula visualization from RealPlayer.
It only works on older Winamp versions (5.24 or earlier), but it also works on JetAudio, MediaMonkey 3.x and Helium Music Manager 10, which all of them work on Windows 11.
Doesn't work on WACUP.