Hi Markus,
Unfortunately there is no ready solution for the same, you will have to do it manually to get the list in expected format.
The best deal for you is to use SUIM with the same limited options and get the list in excel, check with your abaper if you can input the search criteria through SAP script and output it to excel. (Step repeat for different inputs)
The second solution to use SAP query on AGR_USERS and AGR_1251 and get the result to excel and modify.
Hope it helps you to achieve your target.
BR,
Mangesh