Alternatively, you can centrally-enforce a "one active network" policy using something like Senforce's Endpoint...
Security Suite Connectivity Control. According to Senforce's website, "SCC ensures all endpoint devices comply with corporate security policies governing wired and Wi-Fi network connectivity" and "can disallow Wi-Fi usage when users connect to a wired network." If your company already uses personal firewall and/or VPN client software, ask your vendor(s) about "endpoint security" alternatives that may be supported by their product(s).
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