Nevermind I figured it out!
In case it helps anyone else:
Within the file of the template you want to use (1b, 2a, ect) find
textbutton _(url_tuple[1]) action OpenURL(url_tuple[1])
and replace with
textbutton _(url_tuple[1]) action OpenURL(url_tuple[2])
In this instance the first item in the tuple will be the text and the second will be the URL it links to
So in init_credit_objects file when listing the credits you will put "img", "text", "url"
(When I first tried this it kept breaking due to unrelated typos so I had doubt in my code but nope pretty sure this is the correct answer)