Most efficient way to grant roles/data access for users

Summary:

For roles, other than the standard way through tools>security console>user>edit>add roles or my client groups>data exchange>import and load data, is there a more effective way to grant multiple roles to users?

For data access, other than setup and maintenance>manage data access for users and using the authorize data access spreadsheet, is there a more efficient way?

What about combining both processes so that both roles and data access (for certain sec contexts and sec context values) can be assigned in a centralized manner? Kept this somewhat broad on purpose; want to gain insights on the available/best methods to provision roles and data access to end users in Fusion.