Have exactly the same problem. Where do I change the default font? Wondering if you got a good answer to the question because the question is old you have resolved the issue, you can tell us!
I work from a graphic profile where the font is Calibri and there is no good way of working to change all objects all the time .. must be a setting you can change the default, but I can not find it
Drag and drop a text field from the library. The default font is Myriad Pro.
Change it to your desired Font.
Delete the existing text field object from the library.
Add your new text field object to the library.
Your default Font is now stored in the object in the library.
Fantastic, it works .. you saved my day and saved a lot of time for me Thank you so much!