There is a section here on dual booting using systemd boot. Never used it, but it will hopefully work in your case, or at least point you the right way.https://ostechnix.com/dual-boot-windows-and-pop-os/
Bodhi Linux. Lightweight and beautiful
Yes , and usually has a picture of a pistol pointing at the observer. Frequency of use varies from place to place.
You may be out of luck for now. https://github.com/sddm/sddm/issues/1399