USB Overvoltage and ESD protection
The LTC4361 is a protective device. If it can hold up to 85V overvoltage in DC mode, it likely can hold a lot of 50-ns-long ESD events. Although the datasheet doesn't have explicit ESD data, the first page states: "No Input Capacitor or TVS Required for Most Applications". No "TVS", "Transient Voltage Suppressor". So your ESD concern is likely without much merit.

Also, the USBLC6 doesn't "just clamp" voltages above normal working level of USB, for normal voltages it clamps nothing, this is its function.