To be fair alt+super+S doesn't seem* to work on most* Mate based sitros. It does however work fine on Gnome.
* The ones I've tried with Mate that is, Solus, Antergos, Ubuntu and so on don't work with the alt+super+S combo at least here
Have you tried installing the Gnome and Mate dsktops and seeing if Gnome fixes the Orca starting issue? At least here for me, Orca 3.28 works perfetly wll with Gnom and starts up at log in, and works very well. I'm not sure if there's something about Mate that maks Orca not start up automatically though.
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