Hi jackie_w,
In my experiment with Georgia, I notice that it is a very common font and available in Window. I simply open "font" folder in Window, check the information of "Georgia" in that folder, modify any font I want so that it has exactly the same information with "Georgia" in Window.
Attached are two picture of my Forma's homescreen and pocket screen, in which I "trick" the system into replacing default Georgia with EB Garamond Medium.