David,
Looks like you would need to do some work to get the data together in a single ‘column’. The FeedTrackedChanges object (that holds field changes on a Chatter tracked change) can only be queried via it’s child relationship to the Opportunity Feed. See this page-> http://www.simplysfdc.com/2013/08/salesforce-feedtrackedchange.html
I’d add the child relationship to the OpportunityFeed model and then bring the data into your custom render. Use the ‘Feed Item Type’ field to choose what to show.
Thanks,
Bill
