I was recently exploring this case, where you accurately isolate particular applications to using a VPN. The best guide I found was this one (https://coldfix.eu

I was recently exploring this case, where you accurately isolate particular applications to using a VPN. The best guide I found was this one (https://coldfix.eu/2017/01/29/vpn-box/ https://coldfix.eu/2017/01/29/vpn-box/) which goes into more depth and looks at alternative approaches as well.