The idea here is good, but your conclusions are off.
VPN to Tor has no real benefits. The Tor project itself says this; if they manage to intercept and decrypt Tor traffic, then this spy would probably not struggle with doing the same with your VPN (or they might not have to, most VPNs won't go to court for you and will just pass it over to whoever asks).
Not that the federal government or even the local cops would care much about degenerate porn habits as long as they aren't genuinely illegal. Nobody really wants to deal with the legal trouble or the bad publicity that would happen. Hell, you can easily pass this website off as an interest in transgressive art, it's pretty well known in the art world. They would only be paying you a visit over Gurochan or "other degenerate sites" if you were up to something that is actually against the law. A more realistic threat would be a man in the middle who wants to blackmail you.