Don't bind the column to a different object; instead, implement the table view data source methods (either in your array controller subclass or in the controller class that manages the array) and implement them just for that column to return the derived value. (And set the datasource for the table view appropriately.)
The table view will take values from bindings first, then look for a value using the data source methods, so the other columns will continue to work as they did before.
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