I think they already work in blender (there even is https://www.printables.com/model/908684-spacemouse-mini-slim-profile-with-easier-assembly https://www.print

I think they already work in blender (there even is https://www.printables.com/model/908684-spacemouse-mini-slim-profile-with-easier-assembly https://www.printables.com/model/908684-spacemouse-mini-slim... - which I know works in freecad)