I think it’s very possible. When I was looking through reddit for Moonlander reviews a few month ago, a poster was saying they would support it in an upcoming keycap set they were designing. Their post in contained in the first thread linked.
However, it really is the case that any Cherry compatible keycap will work. It will just mean a change from the current profile. Here’s a few threads discussing different possible options. So the sets you posted could work.
https://www.reddit.com/r/ergodox/comments/i849mu/keycaps_for_moonlander/
https://www.reddit.com/r/ergodox/comments/jgu6zo/moonlander_with_pom_jelly_keycaps/