I'd love something that works like this, but with the disk encryption password screen. Specifically, plymouth provides the splash screen on boot with many comm

I'd love something that works like this, but with the disk encryption password screen. Specifically, plymouth provides the splash screen on boot with many common Linux distros. If I enter the decoy password, take some action, like displaying a fake error screen. I toyed around with making a plymouth theme to this end, but didn't get far. It would be nice to have a theme that offered plausible deniability wrt FDE.