Is there a standard for this or any defaults in an OS for this? In the past, I've been monumentally frustrated by the inability to bind inputs to non standard keys.

I've tried building out several projects like this, and using HID keyboard as standard, you are relegated to ANSI keystrokes or combos that a user/os wouldn't need, or third party drivers that come with their own headaches. Another option is a video game controller.

I never understood why we can have a billion emojis but adding some additional unused input mappings is a bridge too far.