Can I use a second keyboard dedicated to macros?

I have used up the seven spare Function keys on my Apple Magic Keyboard 2 with numeric keypad. I'm wondering if it's possible to use a second keyboard dedicated to macros?
From what I can tell this is possible using Karabiner-Elements but, as I already have a registered copy of BTT, I thought I'd try that first.
I'm not sure how the system would distinguish between key commends from the two keyboards as if I just pair another kb they will work in parallel. They have unique MAC addresses of course so the app would need to look at which keyboard the key command is coming from etc.

You can try this setting when recording shortcuts:

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