American living & working in Indo?

As an ex-Indonesian, you have some rights to return, but you would have to give up your US passport to do so perminantly. Ex-Indonesians should be ably to get a non-working KITAS after jumping through a few hoops.

Working in Indonesia as a foreigner isn't all that easy, and human rights groups aren't especially welcome because they tend to bring up subjects that are still either deeply unpopular here and/or people in power don't want anyone to talk about.

As an example, LGBT is a big thing in many western countries, but there's a unofficial, and generally accepted "live and let live, but keep your mouth shut and don't display in public" attitude here. If you try to push gay rights, expect problems, and they might well come from locals rather than government.

The same goes for a lot of other western attitudes and what are now norms in the US and other countries. When it comes to some political points, particularly sensitive ones from Indonesian history, just don't.

The upshot is, getting a KITAS with work permit to work for a human rights group isn't likely to be easy.