Poke3 Built-in reader - global font change?

Since my firmware update in July I've worked out how to change the fonts, line spacing, etc for individual books to get rid of the ill-treated apostrophe. It takes about 45-60 seconds per book and I've got over 8,000.

Is there some way of performing a global operation?

You can do it in my wife's Poke5 but I can't find a way in the Poke3.

Regards - James