I haven't tried it, but I think you can already trigger shortcuts remotely via URL:
https://wiki.keyboardmaestro.com/trigger/Public_Web
MACRO: @Web Open URL Passed from KM Public Web Server
VER: 1.0 2017-02-01 ~~~
DOWNLOAD:
@Web Open URL Passed from KM Web Server.kmmacros (27 KB)
ReleaseNotes
Author.@JMichaelTX
PURPOSE:
Open ANY URL (including custom URL schemes) passed by the KM Web Server
HOW TO USE:
Create a URL like this:
http://127.0.0.1:4490/action.html?macro=<YourMacroUUID>&value=<TheURLYouWantToOpen>
where the <YourMacroUUID> is the UUID of this macro
and the <TheURLYouWantToOpen> is just that, but MUS…
You could easily hook these into a very short Siri Shortcut, or perhaps even a Safari bookmark. Forgive me if you already knew about this and were requesting more native support in a UI!
Cheers,
Joel