Nice! I know that OpenBSD people have been working on a wayland compatible thing which takes into account Linux-specific things (libinput?), but last I heard it's not ready. I have my hopes up though! Could be the year of desktop BSD if they port COSMIC.
It would certainly be easier for them to port COSMIC because there are very few dependencies on shared C libraries. Cargo links all Rust libraries statically, so it's easier to maintain and update components. This will depend how open they are to accepting Cargo and Rust into their ecosystems.