If you don't get any movement at 12 & 6 that seems to rule out wheel bearing. I have done wheel bearings, fronts are much easier to do than the backs since there is no parking brake in the way. And the inner race that often stays on the hub seems to be easier to remove from the front than the back, at least for me (I was able to get them both off with a 3 jaw puller, but had to take both back hubs to a shop to get them removed) The track arms are much easier than the wheel bearings, you are correct.
If it's not the track arms or the wheel bearing or inner tie rod (already replaced with new), I am short on ideas... When you take off the track arm, give that lower control arm a good shake and see if it moves (it should not).
If you are doing them anyway, go ahead and put the car on jack stands, remove that panel, remove the track arm on the driver side and see if the noise goes away?