[galaxy-dev] How to import data from a non-local source using SCP?

I have a cluster (cluster A) set up with Galaxy. Our sequencing data gets mapped to hg19, then the resulting BAM files are placed on a SAN connected to a different cluster (cluster B) that cluster A does not have NFS access to. We cannot install an FTP server on cluster B either. The only way to get data from cluster B to cluster A is to use scp. Is there a way to set up a Data Library in Galaxy on cluster A that refers to non-local data and transfers the data from cluster B when needed? Or is it possible to have a Galaxy instance on cluster B share data with a Galaxy instance on cluster A?