How to remove Moen "flange" or "escutchoen" from deck-mounted tub hardware

I am updating our 1992-era bathroom, including replacing the house's original Moen tub hardware. I have removed the spout and the handles, but there is a flange, or "trim ring" at the base of each handle which Moen calls "escutcheon" - that I cannot budge. Does it screw on? I cannot unscrew it. Is it supposed to lift up easily? I have attempted to pry it - no luck. I then assumed that I must remove the plastic nut (see pic) in order to remove these flanges, but the nut will turn only a few times before stopping. Loosening this nut on either the Hot and/or Cold handle does not appear to loosen the flange. Although I do want to remove both flanges, I do not want to break them in the process. I have looked at Moen schematic diagrams of a similar fixture - T999, but it does not show how the escutcheon is connected. See pics of the Moen schematic, and my tub's handles/flanges. Any tips on how to properly remove these flanges would be greatly appreciated!

They unscrew. Spray the whole thing with WD-40, let it sit then clean that up and work at it. There is years of build up on the escutcheon. If your updating why not pick up a new trim? May need a update kit from Moen. (1-800-buy-Moen) to make it fit but it would look hella better.

I vaguely recall that some Moen trims have reverse threads on the escutcheon.

I will give it a try and report back! I definitely want to replace the trim, spout, and handles - hopefully without having to install a new valve. There is no access panel to the underside of this tub - unless we create one with a sledge hammer... which I would very much like to avoid. Thank you!

Those are standard threads on the escusions.

The Moen escutcheons unscrewed (counter-clockwise) easily after a good soaking in WD-40. Thank you!

See https://www.plumbingforums.com/threads/2004-moen-bathroom-faucet-disassembly.15100/#post-114227