When I apply a GPO that changes Service startup settings, where the default service startup settings are kept? And how can I read and modify them?

The reason of the question is that I have a hundred of servers where most of services are disabled by a baseline GPO for hardening purposes. I want to relax this GPO by removing some services but I do not want that the service startup settings becomes default ones after the GPO is relaxed. So I want to keep the actual hardened state as a default state but allow local admins to change it if necessary.

Thank you