It looks to me like the new amprgw is working. I'd like to ask for a brave volunteer who is willing to try changing his outgoing route from old amprgw (169.228.66.251) to new amprgw (169.228.34.84) to see if he's able to make connection with the outside world.
The return path will still be via old amprgw as we haven't changed the nexthop for 44.0.0.0/8 from oldamprgw to new.
If someone would try this and let me know if it worked I'd very much appreciate it. - Brian