Wayland uses XKB, as does everything else under the sun. XKB is the layer that implements the Compose Key (Actually, you need to configure it via XKB because ot

Wayland uses XKB, as does everything else under the sun. XKB is the layer that implements the Compose Key (Actually, you need to configure it via XKB because other methods like ibus do not bother reading ~/.XCompose which allows you to set your own custom compose sequences)