GPD Win 5 - L4 / R4 Back Buttons

Is there a way to bind the L4 and R4 buttons on the GPD Win 5? I’m on the testing branch and I’ve tried using Dualsense Edge and Xbox Elite as the controller emulation options without luck. I’ve heard a few people have gotten this working by using Windows to set the keys to something else so they can be bound, but I want to avoid using Windows at any cost. I’d love to be able to just do it within Bazzite.

There’s a GPD-WinControl Decky plugin that has worked for past handhelds, but I guess this uses a different controller and it doesn’t work.
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