Setting up Slony might be another option; you'd essentially be following the procedure used to speed up a PostgreSQL upgrade that would normally require a dump/reload.
If you need to do this on a continuing basis, Slony is the best way to go. If it's a one-time shot, I'd just pipe pg_dump to a psql that's connected to PostgreSQL on your 32-bit system.
-- Jonah H. Harris, Database Internals Architect EnterpriseDB Corporation 732.331.1324
