There is at least one very simple response. Set up some deviant CIX, say IX195-8, let everyone with a shortish 195/8 prefix connect to it either directly through their own provider, or indirectly through some tunnel, and have IX195-8 announce reachability of 195/8. That is, in short, altern topology to meet addresses when the converse is too hard. KRE detailed that for the general case, but it would be even simpler in the case of RIPE, since all the allocated network numbers are in the same geographical area.
Christian Huitema
This was proposed and received mild interest about 9 months back. I was able to persuade some people that this was a variant of what was called "provider-based" addressing. It has the interesting trait of also being "geographic-based" as well, for those that can still relate to the old labels. Not enough to take the effort to make it work. I'd be willing to exert some, for any of the existing or planned exchanges, if people thought this would be a viable alternative. --bill