Hi @bocciaman, in this post you will find a way to trigger a KM macro via a shortcut SSH action on the Mac.
In the video you will find at minute 1:20 an instruction for the SSH action.
Please note that this only works on the same network.
Another possibility would be the triggering via an iCloud Drive action:
Simply save a text file in a separate folder (iCloud Drive / Siri Shortcuts) and monitor it with a KM macro to trigger your actions on the Mac.