Just as most posters said, it's highly unrealistic that a Baltic Union would make a lot of difference. Some, yes, but not that much. It would be nice though. If the Baltic Union somehow managed to become full-time members of the Allies and the Allies helped all those "Eastern Allies" to upgrade their military ALOT, then maybe something like this could happen.
I also see a big problem in the formation of such a Union. Lithuania would never join in any sort of agreement with Poland for as long as Vilnius region was occupied. Lithuania and Poland did not have diplomatic relations until 1938 or 1939. This alone might very well prevent any union among more states in Eastern Europe. Maybe Latvia and Estonia would join with Finland, but that would be a tiny agreement. Actually, I think it would have made more sense for Finland, Estonia, Latvia and Lithuania to join the Anti-Commintern pact (they were more scared of Soviets than of Germany).
I like the maps though
I also see a big problem in the formation of such a Union. Lithuania would never join in any sort of agreement with Poland for as long as Vilnius region was occupied. Lithuania and Poland did not have diplomatic relations until 1938 or 1939. This alone might very well prevent any union among more states in Eastern Europe. Maybe Latvia and Estonia would join with Finland, but that would be a tiny agreement. Actually, I think it would have made more sense for Finland, Estonia, Latvia and Lithuania to join the Anti-Commintern pact (they were more scared of Soviets than of Germany).
I like the maps though