I got it added in exactly like Optera does for their mod into a different mod, using Optera's code and applying it to "Matter Assembler" entities from Krastorio2 for example, it was very easy.
There's also an asteroid mining where I suggested similarly; having mining productivity effect their mod too. They decided to go a different route eventually, toggling an "alternative mode" which basically has his mod "send ore patches from asteroids to Nauvis". Which in code-speak means the mod just spawns "x" ores on the ground around a modded entity at a rate that increases depending on how many "asteroid mining" satellites you send into space. That way, since the mod spawns ore patches on the ground, it doesn't need to specifically interact with mining productivity or anything like that since you just put in the standard mining drills on those ore patches.
Very creative ideas all around.