I do not find any references to this in multiple searches, but feel like it must exist - hopefully within the SF GUI.
How do you mass change/edit Field Accessibility settings on an Object? In this particular example, related to Account, the Record Type accessibility per Profile.
There are obvious implications that if you select several Profiles vs Record Types (in the example below) and they START with DIFFERENT settings, it would need special handling (or possibly show that "this is different across Types" or "across Profiles" so that if you don't touch it, it would leave it as-is). It's not as easy as doing a mass-change of Page Layouts, for instance.