You can fake it with a number of extensions, but there's a load of fingerprinting options that are sneakier than the user agent. The Tor Browser project has a document outlining changes they had to make to make things less fingerprintable.
VPN -> TOR = DANGER,
TOR -> VPN = PROBABLY_OK
You should probably make the 'Lahana is not super secure' really BIG and BOLD for the reader so they can understand their risk.