[catching up on old emails here]
But but... that does not work. I tested it, and Brian confirmed that amprgw can not route packets out to the Internet to the BGP 44/8 sites, unless those sites are also reachable via an IPIP mesh. The technical reason is that the first upstream router between amprgw and the Internet has a static 44/8 route towards amprgw, and does not have the full Internet BGP table which would contain more specific routes to the BGP-only sites.
Since there are so few remote AMPR BGP speakers, why not configure these more specific routes on the upstream router as statics? That would be an improvement from what we currently have and the better solution would be to at least have the Internet learned 44/8 BGP routes leaked into this router to avoid using static routes.
--David KI6ZHD