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At a very high level TI has devices to translate between PCIe - PCI and PCI - PCMCIA
I would look at the XIO2001 for the PCIe to PCI translation.
You have already located the PCI1520 which does seem to complete your application.
Both of these devices are very mature, to the point that detailed product support will be difficult to provide. However, the combination does look like it could fulfill your requirement.
