[hypoxia]

Rob, your rear bath looks about exactly like mine.  I plan to add a Tee for a Bidet line, perhaps Sharkbite Tee with FNPT and a bushing.  I put this Handheld Bidet Sprayer in the mid bath & have been very happy with it.

Good to see your positive end result.  I'm on the fence with more filtering.  I think most deposits are dissolved and don't come out of solution until the water is stationary.  If you had a screen before the pump you wouldn't need any at the toilet valves or faucets otherwise.