I'm now running KM9, and integrating it with my Stream Deck. I have played with the actions for setting a SD button Icon and Title. They both work fine.
I see how I would use both to change an icon based on a macro being triggered. Very handy. But what is your vision for how to "set" the default stream deck icons when the computer boots up? Just have one macro set to launch "At Login" that sets all the icons? I think that would work as a hack, but wasn't sure if you were envisioning something else?