^Pretty much this. However...
There is "Focus Status" under Focus in Settings. If you have Focus Sharing turned on, can share Focus Status. Option to specify which Focuses this can happen with. Have not used as I've always have had weirdness when Focus Sharing was on, and ultimately, only really cared about phone Focuses. Mac not important at all, iPad only at end of day/bedtime (that Focus toggles on at specific time). Not sure when this became an option.
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Can have an Automation but have to specify either a sender and/or some text in the message body to look for. Once one/both of these conditions met, can send a Message by setting up the Automation to have a "New Blank Automation".
Pain in the rear to have to setup for every person or a really generic body text that replies to everything (ie. message contains value of "a" or "e" or "t", etc [aeiouts for frequent, "important" letters]).
(Have not tested this myself)
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