In your attached txt was no such client permission set.

*You could work with that client permission where b_client_skip_channelgroup_permissions is set but value and Skip flag are disabled.
*i can't test atm if you are able to set the permission that way or if client would remove permission.

(What else you could do is to remove the permission and set Skip flags in all permissions with exception on b_client_skip_channelgroup_permissions.

You better leave the Server Admin as it is and make a copy and use this copy.)