What is being asked for already exists? It is called Onload.
In addition to bypass onload also provides a full IP/TCP user space stack and non-intrusive support for existing binaries using the standard BSD socket interface (incidentally onload also supports XDP now).
io_uring is really for asynchronous communication with the kernel.
the fib trie is the core of the ip stack - i was using it as proxy for total ip stack bypass.