While I hesitate to field two versions of Norwegian and German infantry on both foot and ski, my solution turned towards using these ski troops as markers. Before, tracking mobility status was kept on a roster but in the heat of battle is often forgotten. Now, a battalion on skis can be quickly identified by placing one of these ski markers next to the HQ stand. For German markers, I'll use the infantry in helmet. For the Norwegians; infantry in cap.
Having finished these ski troops, I plan more digging into the 15mm WWII box to see what else I could finish off in between larger painting tasks. Perhaps, a few British mortars and crew?