Since German factories are closer to France then Russia, and speed seems valuable:
Call me crazy, but what if most of your starting land units move towards Russia, you build your production to hold off France and later take it when ready. You get to use the airforce against UK round 1, France round 2 and Russia round 3.
Your G1 attack on Russia puts 5 armor, 4 Mech, and 5-7 infantry in Eastern Poland…safe from Russia…you can even use the bomber and BB (kill Russia BB) to land 1 troop and art in baltic states.
(I would pull a tank and 2 men from E. poland force with this option. Take hits on land based infantry, then retreat leaving the art and infantry to take and save the Tank from counter attack since amphibious attack is the only attack that allows a split retreat.)
Your production will be closer to France and the defense of Europe. Some units would stay in W. Germany since they are too far from Russia, namely Denmark and Belgium forces. Turn one you build a minor factory in Romania and 3 Mech in Germany, with 2 infantry for W. Germany…Funnel 6 Mech a round to the Russian front, extra IPCs spent defending Europe. Keep one sub in sz125 to deny Russia 5 IPC National Objective.
Crazy? or is it worth trying.
Thats my 2 cents for a G1 attack plan.