How to change attributes of ALL master slides in a KEYNOTE theme at once? Is there a way to change multiple masters at once in Keynote.  Examples


Change the background color for ALL slides from grey to green.
Change all fonts from Copperplate to Garamond
Insert a company logo onto all slides simultaneously.
Change the default background to all text boxes to #6699EE


There is a similar question but the accepted answer explains how to do it for ONE master.

This question was asked once before, in November 2011.  Has this situation changed?
I don't think that it's possible. Each of the Keynote masters are pretty different items, with completely different fonts, objects, etc. It's a failing of the system.