Then you will definitly have to create a copy of the card type. As to how to exactly change the font, I am not sure as I have never done this myself. I just used the default font.
There is no specific option to hide those readings.
@rodrigo09 It shouldn't be a problem as long as you don't do any reviews while the addon is disabled. Another option is just use the Custom Study and increase today's new card limit. But then you would have to do that every day...