I just read something a little similar a few hours ago.

@liketu/introducing-liketu-a-playful-new-experience-on-hive-launching-soon

Another feature, is the ability to lock your "premium" content to subscribers. This means you can post as much, or as little, with no bearing on the reward pool, whilst retaining the potential to earn from people willing to pay for access to your premium content!

Maybe have a look at what they are doing, to inspire you and let you compare their plans to what you hope to do. Best wishes with your project!