Connecting via tunnels to a few (2+) neighbours and running BGP with private AS INSIDE ampr would be an answer. It must not necessarily be public BGP routing. This works neatly. Except the whole IPIP stuff, I have at the moment a l2tp tunnel to the German hamnet, and one PPtP to Luxembourg, both doing BGP dynamic routing (again, these are private AS, for route frowarding inside the ampr space ONLY).
But for this to happen, everyone must allow forwarding through their gateways. And here I have my doubts.
MArius, YO2LOJ