[knazarov]

This is how I do it in keyd by remapping Meta+C/V to C+Ins/Shift+Ins (keyd.conf):

  [ids]
  *

  [main]
  capslock=overload(control, esc)
  
  [meta_mac:M]
  c=C-insert
  v=S-insert

[teo_zero]

I don't get this. You define the layer meta_mac but there's no key that uses it...

[gigatexal]

maybe on a mac keyboard this [meta_mac:M] is the key and the stuff below it is how it's configured? I'm not 100% sure.