Combo display & usb module
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Module/product idea...
Combine the core display module with the usb module, add a minimal HID driver processing for a usb mouse, a config option to use the external hdmi as the "default screen" and if used, have the background task or the module itself process Hid events like mouse movements and clicks, and update a visible mouse cursor on the selected screen, and have a config option to process mouse clicks as touch events for apps.
If present and configured, you could boot up and drive any program or even the Uiflow demo/setup, using a mouse, on the hdmi monitor. might as well add keyboard support to add keypress events.