Volks incendiary nades t0 side tech. 100m 10-20f. Allows quick response to garrisoning without having to invest all the way into the next tech.
T0 MG34, no truck needed.
ISG smoke barrage.
Reduction of medic and repair side tech costs by accommodating the costs into things like truck setup costs or forward retreat point upgrade. (Side tech of Flak gun to unlock panther seems quite feasible.)
Those ideas are beyond being considerable for two reasons:
1.: The side tech would be entirely pointless, because every OKW player had to go for it anyway. No grenades on their main infantry? No easy access to an alternative? That's the reason why USF got their ridiculous mortar and why everyone wants to keep it in the game, despite it working against anything the faction was designed for, which in term makes it completely unbalanceable...
2.: The costs you want to redistribute to other things would be extremely pointless, because these things are already fucking expensive. Sure, that would make healing and repairing (which is kind of stupid on OKW anyway, if we compare repair speeds with, say Soviets or Ostheer) more accessible, but at the same time nobody would ever again go for the retreat point, because it is on the verge of being unobtainable in anything but 4v4 already. At the same time, the cheaper USF tech gets their retreat point for free by the way, combined with cheaper healing. Something doesn't add up here.
If you want to lock things behind side techs, the teching itself has to become cheaper - that's the reasoning behind Brit teching being so bloody cheap. Alas, that adjustment never properly took place when it came to OKW and their healing (yes, there was an adjustment, but we can easily see now that it wasn't even close to being enough).
This actually serves as a pretty good point to demonstrate the main problem with the game's mechanical design: Inconsistency of rules. Be it the Cromwell having a lower moving penalty than its equivalents without having the weaknesses of the Sherman (which justify the Sherman having that lower penalty in the first place), or be it the StuG E still working with the call-in meta that was supposedly fixed over a year ago...