lots results when I google 'wayland clipboard manager' - here's the first
* It's not exactly the same, but I use Kanshi for dynamic output configuration. https://github.com/emersion/kanshi
* https://github.com/bugaevc/wl-clipboard
* https://hg.sr.ht/~scoopta/wofi
* https://github.com/yory8/clipman
* There's wlrobs for OBS. There's grim/slurp/wl-recorder for use outside of OBS.
* You can use grim to grab a particular color on the screen, but the UI wouldn't be as good, of course.I personally found it annoying enough to install clipman[0] for my sway setup. Especially with short lived applications like calculators etc.
Haven't tried this yet but worth looking at?
https://github.com/yory8/clipman