There were custom "generic" File Info panels and Bridge Metadata Panes created for PRISM Image Metadata V3.0. You can find references to them in the document "Guide to PRISM Metadata for Images V 3.0". However, prism:expirationDate was deprecated in V3.0 in favor of a structured XMP property (2D array) pur:expirationDate (PRISM Usage Rights). Each row (entry) in the array has up to 3 columns: date, distributionChannel, and agreementID. Clearly, CQ5 uses the simpler PRISM V2.0 property.
Without knowing the details of your situation, I would suggest creating a custom File Info panel that matches the CQ5 metadata menu layout. Many of the fields appear to be "very well known" XMP properties that can be found in the various stock File Info panels. You could replicate these VWK properties in your custom panel in the same order that the CQ5 menu uses.
I would expect the PRISM V2.0 expiration date field used by the CQ5 DAM to be defined as:
Namespace Preferred Prefix: prism
Namespace URI: http://prismstandard.org/namespaces/basic/2.0/
Property Name: prism:expirationDate
XMP Property Type: Date
Regards,
Carl Rambert
rambertc at cox dot net