Those are nice, but they are strategic choices made by the Allies, like a counter-move in a chess game. They are not considering the political ramification of decisions. We have lots of examples of those in the game : the DOA on Poland, the DOA of France and UK on Germany, in the 39 scenario, the prerequisite for the DOA of Italy, the US/USSR entry modifiers for certain events, the Benelux event etc. You just have to look at the Game notes to find lots of examples.
I believe that, for the Netherlands in particular, there should be a trigger following the Japanese invasion. I cant believe they would have stayed neutral the whole war. Hard to negotiate with the US following the Japanese defeat when you did not gave them access to your ports following a Dday event... Maybe the Norwegian trigger should be tied to the same as the Swedish one, Paris in allied control. Maybe unprotect the trade route if not in German hands... there is a lot of possibility. As for Greece, I cant believe they would have stayed neutral. They might have wanted a piece of Yugoslavia's territory after the war, or Bulgaria or some other concession. Hard to do when you looked on and did nothing. Also, for those countries, I strongly suspect that their preparedness for war would have gone up seeing everything that was going on around them. A boost in their tech and their mobilization at least. There is no surprise after a while. You know the world is in flames :-)
You could also go an other path altogether and give objectives to certain countries to unlock certain advantages. In lieu of a free yearly upgrade of % of the war economy, the special Manpower Germany receives at certain dates, access to certain rare material to get a certain type of unit upgrades... Those are just some ideas.