That's covered by guideline 11.13, which reads: "Apps can read or play approved content (magazines, newspapers, books, audio, music, video) that is sold outside of the app, for which Apple will not receive any portion of the revenues, provided that the same content is also offered in the app using IAP at the same price or less than it is offered outside the app. This applies to both purchased content and subscriptions."

Many only shops will show a price that you pay, plus whatever it costs to get a credit card transaction.

You could do the same here, since it doesn't say "at the same price or less including all fees".

But then again Apple would properly just alter the rules.

Yes, it's a requirement.