Already got the Enterprise from MSDN release. The VLSC version of the Enterprise ISOs are the same as MSDN Enterprise ISOs. But thanks for the heads-up.
All Enterprise ISOs can be activated with KMS. It's really a pity I cannot publish my latest LTSB ISO: sysprep + original WPA (1001 rearms finally!) + updated PE/setup files (something not found in the official ISOs) + many privacy tweaks (GPO, some redundant stuff removed: Contact Support, Feedback, OneDrive, Diagtrack, Telemetry, services disabled, System Restore disabled, etc.) If someone is interested in this privacy-oriented ISO (and if you trust me), please contact me via PM. I really believe you'd be better off using this rather than the official one. It took me so many hours to prepare it.
You can modify file to show Enterprise as EnterpriseS. But I wonder if you can easily modify a package without digital signature check. Run slmgr /dlv and show the result. Enterprise or EnterpriseS?