Afraid not - we went in a different direction in the end.
The recently released stripe integration appears to be on a per-tennant basis. We'd be very interested in a per-user basis - i.e. users of a tenant can choose a subscription level. (We're likely to be working only in single tenant mode, but I could imagine that to support multi tenant properly you'd potentially have a different stripe account for each tenant).
Is this something that is on the roadmap, or that we could easily modify your code to support?