Who would’ve known that a little googling can help you …

So as we all know MX Bikes has no native control setting to re-map the ESC key.

If you still want to pause the game mid-air to scratch your nose (seriously you can do that while whipping) here’s the solution:

1. Get AntiMicro from Releases · AntiMicro/antimicro (github.com)
2. Install software
3. Run software
   
4. Find your input key by pressing any button on your controller, it will be highlighted.
5. Click on the button you want to map a keyboard event to
   
6. Click on ESC.
7. Done, you can now trigger the ESC key with your controller.