I gave up on this sort of thing ages ago because it just wasn't worth the hassle, but the nerd in me likes a technical problem to solve, so... With a decent ro

I gave up on this sort of thing ages ago because it just wasn't worth the hassle, but the nerd in me likes a technical problem to solve, so... With a decent router you could configure it to connect to the VPN of your choice and then route requests from your Chromecast's IP over it. The Chromecast would probably not know the difference, and you can also route anything else over whatever VPNs you like.