Remapping numeric keypad to work as arrows

I find convenient to use numeric keypad as arrows and never use it for entering digits. Until recently I used a third-party tool named Karabiner Elements, but since it stopped working with Big Sur, I am a looking for a way to achieve it without relying a third-party tool.

Tried to remap Xcode (Preferences - Key Bindings - Selection), but it looks like Xcode doesn't differentiate between numeric keys on main keyboard and keypad, so after remapping it become impossible to enter a digit at all.

There is an utility hidutls developed by Apple to remap the keys in the system, which will be ideal for me.
I found an article on it https://developer.apple.com/library/archive/technotes/tn2450/_index.html which however isn't clear enough for me.

Any help will will be highly regarded.

Remapping numeric keypad to work as arrows
 
 
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