Redwood Role before 25C

Summary: How to deal with Redwood Role before 25C?

We are still in 24D and will go in 25A in coming 2 weeks. Our client is doing an impact assessment when to take Redwood RSSP.

Till now, we are creating a custom role (for Redwood) and assigning all the privileges.

We have a Procurement user base of around 3000. So do we need to assign the custom role to all these 3000 users (Suppose we opt for RSSP in 25B) or is there any other way?

Now, if we assign Redwood Custom role to all these 3000+ users, do we have to again remove this custom role, once we move to 25C (mandatory for RSSP)?