Those are looking very cool
Re-sculpting the heads on mine was bit of a chore, especially as the task grew from "I just need a squad of 10 to 15" to "why do I now have 40 to do"
Although I am pretty happy with the outcome, and it did improve my limited sculpting abilities, I really like you head mould idea and wish I had come up with something similar.
I plan on finishing up what I have done and after that may look at getting a few other German minis that have more interesting kit, I like the idea of a few in greatcoats and a few with heavier / different weapons too.
Thanks for the ideas