Keep in mind that NS may have the "have baby" function but it does not yet have any functionality that will lead to sims entering relationships, getting married, and moving in together. So unless you want to do that manually for all unplayed households, NS has a very real shortcoming when it comes to that aspect of story progression.
Regarding game time speed and age durations, I don't know of any up-to-date mods that do either of those things. For good reason...MCCC exists, is modular, and is widely used, so there's no need to re-invent the wheel.
My advice would be to just remove all of the MCCC modules you feel you no longer need due to NS. The other features you mention are part of the core mod, but the ones replaced by NS functions are in the modules that can be removed.
