I hear there are these really cool things called routing registeries. They
allow providers to register and change their routing policies. There are
tools which have automated the process. With routing registries who can
register one-way, two-way, backup, standby, etc routing policies which don't
depend on the active announcement of a route in the BGP tables, but allow
the network sourced traffic to flow.
RIPE, ARIN and MERIT have more information. Ask your network provider to
support routing registries.