You DEFINITELY need to look for an MP40 now. Very few weapons crews were armed with K98 and P08 (e.g. mortar and MG units), MP40/P08 was more common combo. Although P38was officially adopted by Wehrmacht at that time, many mid level officers were armed with MP40/P08 combo.
Once you get the MP40, you need to look at MG42,......where does it stop!? We're all sick.
Congrats on the beautifull/historical weapons.