It appears I figured it out, using the OpenXR route. In case anyone needs it, this is what I did:
-Make sure the OpenXR plugins are enabled for your project
-Install the Oculus PC software
-Go to the Oculus PC software Settings->General
-Enable Unknown Sources and set Oculus as the active OpenXR runtime
-Switch your Meta account to a developer account (possibly unnecessary)
-Enable developer mode in the Meta app (possibly unnecessary)
-Connect the headset via the cable or air link
-In the headset, go to desktop mode
You should be able to use the Quest 3 for VR previewing in UE 5.3. No Android nonsense required.