Here's some visual representations that I whipped up for potential revamps most of the commanders mentioned here, just a note however that these are just my opinions together with other ideas that I've seen from people.
Revamped Festung Support doctrine, based on Smartie's idea of having the Granatwerfer 42 and Forward Supply Station from my Hungarian support doctrine idea, also replaced the Reserves with a proper Osttruppen squad, could also probably be replaced by the Ostruppen reserves of Mobile Defense:
Revamped Luftwaffe Supply doctrine, included the suggested Luftwaffe officer instead of the recon, replaced the air drop with Supply drop from the Osttruppen doctrine to give it some more combat utility and finally the Fallschirmjägers, a good opportunity to add them to the Ostheer finally:
Revamped USF Rifle Company, based entirely on my own opinion:
Revamped OKW Luftwaffe Ground Forces doctrine, based on popular community ideas like the Ostwind and I then combined that with basing it off of the Panzer Elite Luftwaffe tactics from CoH:
I didn't know what to do with Breakthrough besides the aforementioned tweaks to the Sturmoffizier and replacing the Sturmtiger with a StuG III E maybe so I instead did a small revamp for the Fortifications doctrine, based on my Atlantic Wall doctrine idea coupled with some community ideas:
And finally we have the British Special Weapons Regiment, decided to give the much loved mortar from the new and brilliantly designed if I may so myself Lend-Lease Assault Regiment and Crew Repairs, I have no other ideas on what to replace the Hold the Line ability with:
As far as the Soviets go, I have an idea with the MG nests and trenches/anti-tank ditches for the Defensive tactics but I sadly lack the assets to make it. Same goes for the Lend-Lease one.