Looking for Physical Facility/Club Membership Plugin

Hi there… I am looking for a solution for a client, a local pool club with about 400 member families.

I would have guessed that a membership management plugin would be easy to find and I was right there are a ton of them – but most for managing paid content access on a website. There are plenty of standalone solutions out there for sport/fitness/pool club membership, but I do not see anything obvious in the WP world.

I must be overlooking something, ie. just build something using an ecommerce package, but memberships have a bunch of potentially common attributes I would think someone out there has done it.

Any recommendations?

Thanks!