one way would be to enforce app-vpn for the browser and route the traffic trough the company filters.
for used filters, to many solutions out there, one thing would be if your firewall vendor has an option to enable this in your (most likley) already existing device.
as for bluecoat, we blacklisted them. ( https://www.forbes.com/sites/thomasbrewster/2015/03/30/when-censorship-backfires-how-blue-coat-silen... )