Connectionless udp with unet

I am trying to setup a NAT hole punching system on top of UNET but am having quite a bit of trouble as there doesn't seem to be any way to either send connectionless udp packets (or even properly communicate with non-unity applications) or pass a NetworkConnection an already existing socket. I rather like UNET's simplicity, but at this rate I am going to have to write my own system purely with sockets as unity's only solution for NAT traversal is a slow, unreliable, and inevitably expensive...

Connectionless udp with unet