Maybe a bit off topic, but does anyone know about themes or GUIs for LUKS password entry? The command line version has pretty unintuitive behaviour for family members which are used to modern GUIs.
Ah, by GUI I assumed you meant something good indeed booted for hunting things like homes. For during the boot process for mounting an encrypted root, a TUI using something like dialog (https://invisible-island.net/dialog/dialog.html#screenshot and commonly available in Linux distributions standard repositories) would probably be more suited. IIRC it is what Debian use for their text installer. It should be pretty light weight, though it is still something you are scripting and adding to initramfs yourself so there may be more pre-made options that require less manual maintenance.
https://wiki.archlinux.org/title/plymouth https://forum.manjaro.org/t/how-to-theme-luks/79792/2