You can do this in a scenario by adding German vehicles to a US formation (temporarily switch the scenario to Red vs Red add the German tracks and switch back). That leaves you with German crews which cannot be easily changed. It also leaves you with the German markings too but that can be fixed by making sure that the US uses only one type of HT and the German formation they are fighting against does not use that one and then mod that one type to US markings (tagged so it doesn't bleed over to other scenarios) and you can get the above look.