My question is the title, basically. What I want to do specifically, is to remove the First Name and Last Name fields, then add a new field.

Long story short, I can't find anything about this topic in the section of the Developer Guide where it makes sense for it to be.

After playing around with a custom implementation of RegistrationPage and searching various keywords from it in the developer guide, I came across references to the FreeMaker templates, which is where I'm at right now.

Having to then make a custom theme, custom validator, and then make sure the realm is using them both, (since validation issues can arise from using one but not the other,) seems more like a workaround for the issue than a solution, so I want to ask, to make sure this is the intended way of changing the fields.