The Klippe almost looks anodized rather than electrophoresis coated, but I’m hardly an expert on finishes. It seems to let the light through to the bare metal, allowing it to define the reflectivity, whereas the Fjell looks to have opaque pigment coating the metal, more like I’m used to seeing with e-coatings.
As for this solenoid business, adding one to an existing keeb has definitely been done - the question is if I have the patience to troubleshoot it with my QMK n00b-ness.