Have you tried the Pacific War Airfields Project already?
Here is the search link:
If you enter 'Celebes', it gives you the coordinates for Mapanget, which is basically the present day Sam Ratulangi International airport, Langoan, which if not mistaken is also called Kalawiran or Tasuka in other documents, and you have also a seabase at Manado and another one at Kakas on the Lake Tondano.
There was another airfield not too far from the town of Amurang, and I was told by locals it was not too far from the sea, but so far I was unable to locate it properly.
Unfortunately, the North Sulawesi and North Moluccas maps are missing in the University of Texas Austin map collection for Indonesia, which can be found at:
Hope this helps.