Totally agree. The centralized aspect is treated relatively well in the events, so I think a permanent modifier from mission reward should focus on abroad. My pitch for a few candidates: (With numbers adjusted of course)
I think this should be a permanent modifier and trigger when the player finished all 3 colonial nation missions (Australia, North America, Brazil). Furthermore, I think 'Liberty desire from subject's development -X%' should be appended there as it fits Dutch (small mainland big colony) quite well.
I think it should go under Control Coromandel, and become permanent with adjusted numbers.
Not abroad, but bland, safe, and powerful modifier. Could go under Je Maintiendrai.
Also, I think 'Minimum autonomy in trade company -10%' fits Dutch very well and should go into the Dutch East Indies mission.