We do allow the business users to do mass updates using MASS or similar transactions. But this access is given only to the few power users and usually under the Firefighter ID.
Google -> BAPI change vendor site:sap.com -> (or similar) should find information about the BAPIs if any exist for the vendor master data changes.
Using the FMs that are not released by SAP is not much better than BDC.
Also keep in mind that in S/4HANA SAP is switching to the "business partner" functionality, so this kind of custom development will likely only serve you while you're on ECC.
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