I assume somehow the binding of the keys needs to be injected from Geany, though.

No, GTK loads them from the standard places itself (I'm assuming the location you pasted above is one).

This gtk-mac-file-chooser is nothing I have invented, but seems to come from GTK.

Well, my googling can't find it, thats why I asked, but the question was directed to @techee who might.

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