Need email related message attributes be available as variables to be used in other processes such as custom actions

Currently we are using AJO email action to send out emails and we also have a custom action to log the AJO email activities through a custom action into a custom contact history table for our own reporting and tracking purposes. Right now we have to manually find the messageId for the specific email activity and enter that hardcoded value into the custom action configuration. This is time consuming. Also when we need to duplicate the journey, the messageId in the journey copy changes, and then we need to reconfigure it.

Ideally, we would like to see messageId and other message related attributes such as messageName be variables in the interface we can pull in to use through custom actions. If there are multiple email messages in a journey, perhaps multiple email messageId available for pulling or at least the latest email messageId should be available.