Please make osk-sdl useable as keyscript

/etc/crypttab (crypttab(5)) keeps information about encrypted filesystems and it would be great if osk-sdl could be used as script there so e.g. /usr/share/initramfs-tools/scripts/local-top/cryptroot could we could use the distros preexisting logic to figure out the root file system.

I can look at that but wanted to check if there's a reason for going the current route (likeley because it's pretty Debian specific atm)?