I agree that your solutions are obvious; so obvious in fact that I find it highly unlikely that they didn't occur to patreon. What does the likelihood that they thought of these things and didn't do them suggest?

Consider: All of those options require patreon to do significant work to accommodate that business on their platform. All of them also have significant profitability implications for everyone involved. All of them require vigilance to ensure that all content which should be subject to those rules is, and that you have clearly communicated the nuance of which charges are subject to which rules and fees.

Still sound easy? Maybe you should apply for a job there!