What would be the best way to route traffic through the Tor network first, then access a proxy after the last node, and finally reach the destination website? This applies to both smartphones and computers.

this is gonna result in me buying a new pixel so soon lol.

I don't recommend this and I don't try this. RethinkDNS allows chaining numerous WireGuard VPNs. One of them with Tor would do it. All I can think of.