Sending "odd" scan codes with Keybow?

Hi! I’ve been trying for a while to use my Keybow in conjunction with Keyboard Maestro on my Mac. To avoid collisions with other key usage, I’d like they Keybow to send unique (or at least unusual) codes that Keyboard Maestro can trap and use, such as 0x59 (keypad 1). I tried using

keybow.set_key(0x59, pressed)

but no key codes arrive on my Mac – at least neither Keyboard Maestro nor the Key Codes utility show anything. Key codes that are explicitly defined in keybow.lua are seen as expected by both of those apps.

Is this some issue in KeybowOS, or is something on my Mac discarding these “odd” key codes before these apps see them?

Thank you!