Hmm.  So you’d actually beef up the forces in Western Germany?  I was thinking the opposite - that all their offensive forces would be on the Polish border, with W. Germany stripped down to only 2-5 infantry and some AA.  Also, the overall size of everyone’s starting forces would be smaller, to represent the reservists who were still in the stages of being called up, equipped, given refresher training, and integrating new draftees to bring them up to strength.  Also to represent the completion of units that were already paid for and under contruction, but finished between Sept. 1939 and May/June 1940.
For the Germans, I was thinking they’d be minus (in relation to Alpha+3):  1 tank, 6-8 infantry, 3 tactical aircraft (either 1 fighter and 2 tac bombers, or 2 fighters and 1 tac bomber), 1 battleship, 1 artillery, and 1 mech.  These would all be taken from the forces in Germany, W. Germany, and S. Germany.  All of these except 2 infantry and 1 of the tactical aircraft would be received as “free” reinforcements at the end of turn 1.
Now I suppose you could say the Germans may have had a plan to whack France first, and then go for Poland, or maybe try to take them both at once.  I’m not sure how realistic that would be, but meh.  What the heck.  If you wanted to go this route, you could let the Germans shift their initial land and air units between Germany, W. Germany, and S. Germany any way they want.
For France, I’d start them off with only 2 infantry, 1 artillery, 1 tank, 1 fighter, 1 tac bomber, and 1 AA in France; 1 infantry and 1 artillery in Normandy, and 1 infantry and 1 artillery in S. France.  They’d have no units in the UK, of course, and British would have no units on the continent.  The French would receive 1 artillery and 3 infantry as free reinforcements at the end of turn 1, (and maybe they’d start in Holland/Belgium).  The British starting forces would be the same as A+3 minus the aforementioned Expeditionary Force.