Ironically this will create greater balance issues because OKW will have it all. Some of the strongest light vehicles with Mechanized HQ and healing at the base. This is a bad idea.
Edit: I just reread Sander's 4 different versions. The one you're talking about where OKW gets all that stuff for 20 fuel is V4. I am against Sander's V4 changes. I rather prefer his V3 Battlegroup HQ change.
Agreed, that's the major problem with my suggestion. It' just not particularly "fair" if the OKW tech structure remains as it is. I think it would be a good solution, as i said in my previous post, the BG and Mech HQ offerings were shuffled around. I'm suggesting that the initial HQ medic upgrade would only give, say, one-two medics, and the third would be a bonus from the BG existing though.
Having to unit-tech in a certain way just to get healing is unpleasant, especially if you can then lose that healing along with access to units, if your BGHQ is destroyed. Admittedly you perhaps shouldnt have your BGHQ outside of your base sector, but no other faction (Bar Soviets, who have no nondoc out-of-base healing) loses so much from their healing solution being destroyed.