Good point; I never thought of that. I think that might have been the solution. Possibly they had the same idea, but were denied that option because at that point in the war, Germany needed all those magazines and ammo for the Sturmgewehr. Another solution might have been something along the lines of the Steyr M95M: Do away with the enblocs, make a simple box to fit in the magazine well, then load from standard Mauser stripper clips.

Hindsight is great, but we should bear in mind the times. Krieghoff's did all this in a matter of weeks, working under terrible conditions and given no resources. It's a wonder they accomplished what they did.