Aloha all,
I use Hawaiian words extensively and they often require a macron over vowels, so Ā ā Ē ē etc. in HTML or \=A, \=a, \=E, \=e, etc. in LaTeX.
My idea is to have a single org-mode document that I can export to LaTeX to interact with my colleagues, and then export to HTML for journals that require submissions in Word format. I'm using tex4ht now, but an org-mode solution would be simpler and more direct.
All the best,
Tom