Note that neither the Dutch Communist Party (CPN) and the National Socialist Movement (NSB) were big players in the Netherlands. In the elections of '37 the NSB got 4% of the votes. The amount of people willing to fight for the ideals of Mussert might be 1% at most. The CPN had something like 10.000 members in 1939.
Just wanted to remind you that a civil war or even large scale disturbances are very unlikely and will probably be squashed in a day or two.
Absolutely agree. The army will put the disturbance out, but it's going to create a real culture of tension if and when the Germans invade.