Excuse me for responding myself here. Just like to clarify my previous
message a bit.
The note below does not intend to solve Randy's problem for his chosen
policy. It rather intends to describe a different policy used by many
ISPs which won't run into the same problem.
IMO, ISPs who are engaging in the 'hot potato' routing practice have the
obligation to announce consistent routes to its peers at different peering
points. It may require an ISP to change it's internal policy to achive
this with reasonable maintance work (like the one described below) or to
excercise whatever internal policy it decide but do more work (configuration
management,etc) to fulfill the obligation.
speaking for myself.