You can reinforce a space in noncombat movement, whether you attacked it or not. The only restriction is that you can’t move air units into a newly captured land territory.
All of the Dutch “places” are islands, so no, you can’t build ICs on “Dutch places”, but only because they’re islands, not because they originally belonged to another country. For instance, both the Allies and Japan have the option of building an IC on French Indo-China if they gain control of that territory.