Update: I picked up these sealed DVD audio discs for the bargain price of $2 ea. to see if they would play in the PWT.
Two are 24/96 and the other 24/192. Unfortunately neither of these types work. However, the content plays just fine if extracted as .wav and burned to a DVD (and sounds great!). I don’t think I will try to collect more since it’s a bit of a faff to turn them into a playable disc.