How can I add kahako to Hawaiian words in Bookman Old Style?

Aloha,

Just finishing a book in InDesign. I place the ‘okina as I write and then go back at the end and add the kahako. Since the book is in English this is not  monumental job.

Parameters are:

SYSTEM: OS 10.12.5

PROGRAM: InDesign CS4

TYPEFACE: Bookman Old Style

MISC: Hawaiian Flag Keyboard selected

When I go to add the kahako in Kalakaua, for example, I hit option A and instead of diacritical I get a pink box.

I searched under GLYPHS and no macron/kahako exists.

Any thoughts of how to accomplish this?

Thanks,

Mac