Remathilis
Legend
Re, the bolded part: isn't that what the sidebars and/or sections with advice and/or options for including things that are normally restricted going to do?
I mean, if the book just said "X, Y & Z are banned" then you'd have a point. But, if the book says the following (which is what I'm advocating for), the limited appeal based on restrictions argument evaporates, "X, Y & Z are normally not a part of the setting. Here are some variants that will fit with the themes of the setting. And, if you are set on using the originals, here are some ways you can incorporate them into the setting."
Let me quote the 3e Dragonlance book for a perfect example of what I think would work well for me, as well as for you...

That's all I need for coverage.