So I had actually spent a significant amount of time working on this particular idea a few months ago. I coded a ton of changes to the Panzer Elite with the intention of making their design more flexible, fun, and balanced and then releasing the results as mod. Mostly I moved units around and added and removed some stuff. I haven't made any changes to the British faction yet because I feel their faction design is so flawed they need a complete overhaul and doing that is beyond my limited modding abilities.
I really like your non-doctrinal changes to Panzer Elite, seems that it completely changes their dynamic. Can't agree with most of the doctrine changes though, especially completely removing Luftwaffe doctrine. As earlier said, Panzer Elite was based on the rag-tag group of troops that retreated from France and faced the British during the Operation Market Garden. I would though change some of the abilities that they receive from doctrines.
Touching the British subject, I once had a crazy overhaul idea of my own, aimed to change the ridiculous mechanic of blobbing around the lieutenant. First of all, I made the British units move at full speed even in non-friendly territory, made Tommies cheaper and weaker, but kept the reinforcement cost the same (probably should change them too). The weirdest thing I planned was to give British global veterancy that they actually unlocked from earning experience. Basically, you go along earning your exp as usual and when certain number is achieved in the global experience pool, you had a choice in your HQ to pick between global vehicle or infantry veterancy.
The lieutenant and captain lost their "aura" bonuses for other abilities, some of which were unlocked after picking doctrine plus they weren't one man squad any more. Plenty of similarities with officers in CoH2, but I think that it's way better this way.
Though I did plan to make changes in the doctrines too, where Royal Canadian Artillery was to receive the most changes, as I wanted to make it less about artillery, but also about assault follow.