I don't know what new answer you're looking for.
You can do that work if a PT gets an IMTA for you to do that work, we've covered that.
Doing that work as part of your wife's CV simply falls under Article 61 of the immigration law, which you can see is quite vague.
To an optimistic foreigner, Article 61 clearly permits you to do the work you describe. However, those with years of experience here know that laws sometimes (often?) get interpreted to the detriment of the foreigner with additional stipulations added at the whim of the Kepala [fill in the blank].
You can choose to work in a relatively quiet, non-visible way and probably get along fine forever.
Or you can choose to work in a more publicly visible way, knowing there is a chance you will be a combination of fined, jailed, deported, and blacklisted. And if you fight through it with huge legal bills, you may become the example which finally clarifies how to interpret Article 61 before the Indonesian Supreme Court.
I don't know how anyone here could offer you any more assurance than that. The one other option I see is that you could ask your local immigration office if you are allowed to do the work you describe based on Article 61. If their response (in writing!) is favorable, you can feel mostly assured. If their response is not favorable, you could get lawyers involved and try to fight through the legal system for an official, and hopefully more favorable, interpretation of Article 61.