Floating windows without external display

[u/deathwanker]

Originally posted this on r/GrapheneOS, but it was removed.

I really want to use my Pixel 8A running graphene like a desktop computer with floating windows without using an external display. I don't care how inconvenient to use or inapropriate this sounds. From what I understand, in older versions of Android (and graphene) this was not difficult to achieve, it involved flipping a setting in developer options, or using ADB; I have tried following these instructions and others like them, without success. I have tried using apps such as taskbar and smartdock but I seem to be encountering this bug. I know graphene can behave this way with a mouse and keyboard when attatched to an external display, but I want to use the internal display. It seems to work on the tablet version of graphene. I know this type of functionality is not the priority of the developers and probably has more to do with decisions from AOSP, but does anyone have any idea how I might persuade graphene to behave the same way as the tablet version, or, is there a way to simulate a virtual display (and send input to it by touching it, unlike the virtual display developer options) or some other way to bodge this to work? I also wondered if the table of config settings here is a clue, but I'm not sure where these described config settings are saved or how to change them.