Your tactics are sound. The first match I tested the okw with on launch I actually did this build. I read what the infrared half track was. Right away I was like wow this is a cool unit for auto aim and fire artillery such as the field gun. So then I build a few guns and laughed my ass off. You don't even have to tell your guns to shoot enemy squads. It will do it all for you.
It is a very pleasant way to play with the OKW. You simply need to do this build and run around with spios and at volks mopping up the rest. Although a great build it does pigeon hole you into one build to stop maxim spam. Hence why the rifle grenade via doctrine or tech would be a nice addition. Although it needs to be removed from the OST core abilities to be fair.
Problem is by the time you get an infrared truck and a couple of field guns, the soviets and USF will already have proper tanks and more infantry.