I think instead of developers needing to handle many requests to change the controls, it would be prudent of Meta to introduce a controller overlay that users could tinker with.
Not just for buttons, but joystick axes as well. (Some VR games don't even use up or down on the right controller. Free real estate!)
As shown by SteamVR, there's a a number of possibilities that open up with this kind of input overlay, such as:
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