So what exactly was this doppelgänger? It was a special edition of the rival Irish Mail on Sunday, "designed for" Tribune readers! Talk about kicking someone when they're down!
The Mail's editor launches a circuitous and highly unconvincing argument about keeping people in the newspaper buying habit. It strikes me that the exercise was nothing so much as a print media adoption of 'phishing' techniques popularised on the internet.
There's certainly not much in the way of industry solidarity for a paper fallen on hard times.