Nice thread. From what I can see, UWW+ does a nice work as waterless on coated with PBL cars.
However, the 'protection' it leaves 'hinders' a bit the coating properties, because the top layer 'acting against' dirt and water will actually be the UWW+ layer.
That said, if left unwashed for ~a month, when washing, it may look 'beading and even sheeting were killed', but it's just a matter of rinsing well and wash to remove the dirt layer, at the final rinse you should have a normally beading / sheeting surface.
Beading or not, the greatest sign that a coating still working is when you 'pass your finger' very gently over a dirt spot and you notice although there's a THICK dirt layer, it's not sticked to the coating (beware passing fingers over dirty cars to avoid scratching).
Everything you use as drying aid with a coating may have the same effect, leaving a layer that will repel things generally worse than the actual coating.
For me, the better washing I can make to maintain coated cars either use a strong soap (like Hyper Wash), to leave surface squeaky clean, or the actual PBL Coating Shampoo (I'm totally sold on this Soap!!!, too bad it's expensive for general use).
*The 'light soap' approach generally used to maintain waxed cars is not the protocol I use with coated cars (not always).
The cleaner you put your coating (sometimes you can even clay it!), the more beading / sheeting you may have. Coatings 'like to act' clean, uncontaminated.
As drying aid, PBL Booster or the Detailer is also all I should use to maintain PBL characteristics. By the way, Reload is something I like as well.
Reset soap from CarPro looks like an interesting option for coatings.
Iron-x also cleans the coating very nice when heavy cleaning is needed, without adding any mechanical marring like you risk when claying.
I may use the booster after a thorough cleansing like this cited with Iron-X.
Just $0.02, looking forward more updates on your testing.
I liked your eraser experience, and Bob's suggestion for warm water. May try them at some time.
Kind Regards.