Can you have one focus mode and configure the action button on the Apple Watch and the iPhone respectively to perform different Shortcuts based on which device they were triggered from?
Would a shortcut like this do the sort of thing you want? It checks if you are in a particular focus mode and if you are on a watch or not, and then determines what shortcut to call next.
Thank you so much, Sylumer, for pointing me into the right direction! I made my own version.
I now have the option to use both action buttons for 2 different purposes, while on the same focus mode!