Asus ROG to DIY Switch?

I guess I have to hijack someone else’s thread still???

I have an Asus ROG Phone 2 with their specifically made Kunami something or another Bluetooth capable gamepad.

How do I bind buttons? and is it possible to have 2 Bluetooth gamepads on the same RetroArch software?

Ideally, I want to be able to turn this 1tb device into a makeshift Nintendo Switch and manipulate the entire RetroArch software without ever having to touch the phone.

If someone can clue me in as to setting “port controls” I believe the software labels it, I would be very appreciative.

My intended setup is 2 controllers and a specifically made Asus tv/monitor dock so I can enjoy this system like a conventional game console.