I don’t use the Stripe Plugin. I use the Stripe API as it gives total control over how things are setup in your app.
In using the Stripe API I do all the API calls in the backend workflows and use the ‘ignore privacy rules’ feature of backend workflows to enable purchasers to purchase products from sellers whose data are secured through privacy rules.
I can not suggest privacy rules for your use case from a specified standpoint. However, you should attempt to ensure your User data type is secure through privacy rules while still allowing the seller details to be accessible. Otherwise, I’d consider using the API implementation.