Cam, why would you ban UDP when you fix source routing at layer 3 instead? The amplification attacks depend on IP transit providers routing packets from ports with a source route in that packet that arrive from an interface where they could not possibly have originated. Every router knows from static inspection of its route tables which interface a packet with the bogus packets source route would get sent to it if we…
that doesn't help you when the spoofed packets come in on a default route because somebody else's network is poorly configured. Nor does it help the person the spoofed attack is directed at.
This sounds like a job for a coordinated botnet to experiment with. A master controller sends hosts in the botnet a list of a few other devices it controls. The infected host A sends infected host B a spoofed UDP packet (or a series of packets with different spoofing options). Host B then sends the master controller which packets it received and now a map can be made of which networks allow spoofing.