Send view email link into a Salesforce CRM custom object?

Similar to how we display a preview of sent email in Marketing Activities, is there a way to grab an email activity ID or system link from the email send action, and put it into a CDO, for the purposes of synchronizing with a Salesforce Custom Data Object?

Background: Our Salesforce team has a SAP Quote object built out, lookup is done on documentID / quoteID, but the one piece of data they're unable to add to each quote is a link to view the email in Eloqua that was sent by our transactional email delivery system. This would allow sales to confirm what went out and reference it.