There is a great app called proxychains. And it’s more up to date fork proxychains-ng. Those allow setting combining multiple proxies together. Which acts akin to diy tor network. It’s possible to add as many proxies as one wants. So it becomes pretty hard to figure out where the original operator is from. But the main issue with this is lack of tun support out of the box. To solve this I use multiple vms with v2rayN since people recommended me when I asked for programs capable of forcing entire operating system through proxy
P.S. If you wonder what’s the point of this then try to register github account anonymously. Or any social media for that matter. They all in preventive fashion outright ban you if you dare to use any privacy respecting browser and/or tor network
proxychains itself is the wrong layer if you need TUN/full-VM traffic. In Qubes I would do this as a separate ProxyVM/NetVM chain instead: app qube → proxy/vpn qube(s) → sys-firewall/sys-net, and make sure the app qube has no other NetVM path. For transparent TCP/UDP redirection, people usually look at redsocks/tun2socks/sing-box/xray in the proxy qube, but DNS leaks and UDP handling need testing.
For account creation specifically, many sites block datacenter/VPN/Tor exits regardless of browser. Chaining more proxies may reduce traceability, but it can also make abuse scoring worse, so I would separate “hide origin” from “look acceptable to GitHub” as two different problems.
I don’t know what is the right term for this apart from proxy chaining. I been doing what you described before. But I encountered the issue where each additional proxy requires using another Qube. So 5 proxies in row will look like this app qube → proxy/vpn qube(1) → proxy/vpn qube(2)→ proxy/vpn qube(3) → proxy/vpn qube(4) → proxy/vpn qube(5)→ sys-firewall/sys-net. Yes it may be decreased by using minimal templates but does not sound effective. Another issue was me unable to make any working chaining except for two scenarios. Either it was working with my vpn qube + sys-whonix qube. Or with vpn qube + sys whonix + vpn qube. Everything else just straight up failed for whatever reason