There’s a problem I haven’t solved yet with using keypads/keyboards like this which already have a character assigned as triggers for macros. Yes, you can trigger your macro to fire, but the keystroke still exists. Unless you can like swallow or capture it somehow, so that the keystroke doesn’t get sent to the system as input, but the macro action triggered by it still does…
I took apart my keyboard and something incredible happened…
Tim Boucher

Hot Keys and Device Keys in Keyboard Maestro

“Keyboard Maestro has two primary key triggers: hot keys and device keys.
Hot keys intercept and swallow the key press but cannot distinguish between the same key on different keyboards.
Device Keys can distinguish the key on different keyboards, but do not swallow the key so the key continues to perform its normal function.”