Hi All, I'm now a bit less convinced that the switch its worth the pain of getting through the transition, but I'm still not strongly against it.
To move forward I have created a branch where MRs are welcome: https://salsa.debian.org/debian/shadow/commits/move-login-to-util-linux. I' have also converted the shadow the package to dh and cleaned up it a bit. /etc/securetty is dropped, so we don't have to drop it if the move to util-linux finally happens. Cheers, Balint