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Create a Mullvad account and generate a Linux WireGuard configuation without IPv6 (UniFi does not support this yet). Make sure the configuration points to one of the Tirana exit-nodes. 
 Load this configuration into your UniFi site under VPN > VPN Client. 
 
 Now create a policy based route for the following domains to the Mullvad Tirana VPN. 
 
 youtube-nocookie.com
ggpht.com
ytimg.com
youtube.googleapis.com
youtubei.googleapis.com
youtube.com
youtu.be
googlevideo.com