Jackie, I tried your test, but Original = Amasis no matter what. I also tried some other combinations in calibre CSS with no results.
Anyway, I can hard code my GeorgiaEInk15 in any book when I want it. It happens that my second favorite font is Amasis, so that is a good thing on the T3!
A couple of the other Sony fonts will be OK for a change now and then.
Thanks for your efforts.
Kobo? I think we need you to get your hands on a T3.