Ostheer tech idea
by Wordsmith
This is pure the idea of tech possibility, not whole concept. It could be used as combination with other veterancy proposals, units, doctrines etc.
The idea is to make all buildings available from start (similar to soviet) but teching would be performed as "Campaign/Operation support" and would include to spend not only the resources but also some units. "Campaign" would be issued from HQ with special buttons. The prerequisite of teching would be to send some infantry units inside HQ and those units would be sent along with some resources to support distant campaign which would be part of Eastern front. This has to reflect the fact that Eastern front was huge battlefield where many local battles were fought at one time and German troops assisted each others during those battles. And player as a commander of some Ostheer part should assist other commanders who need support.
There will be always 3 buttons - as commander decide how much support he wants to send. When pressed, teching (or in other words support were sent) will start and would not be possible to cancel and units stationed in HQ will disappear. There would be obligation to have at least one unit which would be needed to tech-up.

The benefit of sending more support will be that in return after some period (like about 2mins - when teching would be done) those units which were taken will return with some bonus (veterancy or upgraded) and if more supplies were sent then some bonus unit will arrive along with them. Those units will arrive as all call-in units on map border. The bonus could be also something different like some global ability which otherwise wouldn't be available/accessible. Or it could be dynamic - meaning that every time it would be something different, random pick but balanced so player doesn't waste resources but will not know what will receive - like Kinder surprise

The number of Campaigns could be 3 or 4 representing tiers. After new tier will be unlocked, then new units will be available.
Example build-up
Please note that all costs and units are used only as rough example, it could be fit and designed to meet actual concept:
Infantry barracks (150 MP)Tier 0: Ostheer infantry (general inf)
Tier 1: MG34 (suppress unit)
Tier 2: Gebirgsjäger (scout, long range)
Tier 3: Stormpioneers (close combat inf)
Tier 4: Assault infantry (AT inf)
Support barracks (200 MP, 10 Fuel)Tier 1: 7.5cm le.IG 18 infantry gun
Tier 2: Halftrack (possible upgrade to Flak or other...)
Tier 3: 7.5 cm Pak40 AT gun
Tier 4: Raketenwerfer 56 (rocket arty)
Armor barracks (250 MP, 20 Fuel)Tier 1: PzII Luchs (recon)
Tier 2: PzIII (general tank)
Tier 3: StugIII (assault gun)
Tier 4: Tiger (general tank)
Campaigns:Tier 1: Barbarossa - invasion to Russia
- light support - (200 MP, 10 Fuel), bonus received: none
- medium support - (200 MP, 20 Fuel), bonus received 7.5cm Inf.gun
- heavy support - (200 MP, 25 Fuel, 50 Ammo), bonus received PzII Luchs
Tier 2: Taifun - battle for Moscow
- light support - (200 MP, 25 Fuel), bonus received: none
- medium support - (200 MP, 35 Fuel), bonus received Halftrack
- heavy support - (200 MP, 40 Fuel, 50 Ammo), bonus received PzIII
Tier 3: Fall Blau - Kavkaz fields campaign
- light support - (200 MP, 35 Fuel), bonus received: none
- medium support - (200 MP, 45 Fuel, 50 Ammo), bonus received Stormpioneers+Gebirgsjäger
- heavy support - (200 MP, 75 Fuel, 100 Ammo), bonus received StugIII+PzII
Tier 4: Unternehmen Zitadelle - Kursk battle
- light support - (200 MP, 50 Fuel), bonus received: none
- medium support - (200 MP, 50 Fuel, 50 Ammo), bonus received Assault inf+Halftrack
- heavy support - (200 MP, 100 Fuel, 100 Ammo), bonus received Tiger
So f.e.: if player decide to tech from Tier3 to Tier4, he will put 1 Ostheer inf. and 1 Stormpioneers inside HQ, select Heavy support -> those 2 infantry units from HQ will disappear. After 2min. they reappear at map border with +1lvl of veterancy along with 1 Tiger and are available to player's disposal.
Example pictures to show the basic idea:


I hope pictures helped to clarify my idea a little. It sounds complicated but it could be fun to play especially if bonuses were some unique abilities. This could give player lots of possibilities.