I did this in a variant I had called “Empire builders”
Rather than just make a COMPLETE price sheet that’s independant for every country, In order to keep balance what we did was give each nation some specials. So there was SOME variation, but not so much that it was a game breaker.
We did it as follows for each nation.
1. Air
2. Land
3. Sea
4. Economic
5. Special
Some nations, like Japan for example, had thier specials naval, land, and sea, all support conflict on or surrounding Islands, where as the russians, mostly had strict LAND advantages. For example, Japan had dug in defenders, 1 infantry, would always score 1 hit, on the first round of combat, and they’re special was they could build kamikazies (Up to 3) anywhere they had a complex, the chips would then sit under the complex. Russia, had a special unit called “the train” we used old transports from original, and they could cary 3 inf, or 1 inf 1 art, 3 land spaces. But they could also be captured… Their economic special, was +1 inf anywhere they had a complex.
That could be a place to start for you.
OR, you could buy a copy of XENO games World At War, which had individual pricing for each unit, for each nation. But it was unbalanced in my opinion.