What does a VPN do that incresing the number of hops wouldn't do better? And do you have any source for your claims that 50% of Tor nodes are compromised, or that timing attacks are currently present and identifying any Tor users?
Also, have you considered the possibility of increasing the default number of Tor hops without relying on onion links? By the way, onion links should not be treated as having 6 hops, since the owner of the onion site knows 3 of the hops and because site owners are treated as malicious in Tor's threat model.