I let my PS5 update and did some experimenting with a Cronus Zen and Remote Play on Android. This could be helpful for Zen users who do not have access to a PC for remote play, however you will still need one to prepare the Zen prior to use.
These are the settings for the Zen using Zen Studio:
Emulator output protocol set to Playstation 4 and Enable PS Remote Play.
Connect the Zen output port to an OTG USB cable from the Android device, with either a DS4 or Dual Sense controller connected to A1 and the Quadstick connected to A3. Have the controllers both OFF and connected to the Zen before plugging the OTG cable it and powering up the Zen.
The PC version of PS Remote Play does not need the Sony controller plugged into the A1 auth port, the Android version did.