Before it comes within miles of the host sending it.  After not informing the public who the UDP is coming from.

The UDP sending address doesn't have to be public knowledge, since not anyone can necessarily subscribe to it.  It would be a private UDP feed only offered to specific known sites.  The UDP feed would be used to drive the services of other sites who currently get it via websocket now, who in turn could provide that data to other downstream TCP websocket clients.

Yes, UDP stands for Useless Deprecated Protocol, it's that protocol that automatically detects and cunningly removes any information and redundancy you add to transmissions to help an application using it detect and recover from losses of datagrams, thereby making it useless as an upstream data source for scripts.  It is also a protocol that is specialized in conveying data that, by virtue of having traveled via UDP, becomes impossible to republish on a TCP stream for the benefit of being consumed by scripts, to help increase the workload of script writers who of course will want to implement a UDP listener in their scripts directly.  It is commonly known as an unreliable protocol, and it gets this reputation by sneakily altering important data in such a manner where it cannot be made reliable through other methods.  In fact, it even warps the minds of people considering using it, such that they cease to even know what UDP is!