A useful way to integrate function keys in to layout on Moonlander or Ergodox?

Has anyone found a good way to include function keys (i.e. F1 - F12) in to their layout on the Moonlander or Ergox EZ?

I have tried adding double tap to the numbers row but find myself accidentally double tapping while typing (e.g. 1223). I tried tap and hold but found that it would often end up detecting a held key (i.e alt+F4 F4 F4).

I am looking through Moonlander layouts in Oryx but am not finding any good ones. It looks like many don't even include the function keys.

Edit: I'm looking for a good way to do Ctrl+Alt+F[num] or Alt+F[num]. Without having to switch layers... if there is even a good way.