I pretty much agree here. What would be the advantages of said program over the traditional model and path? This sound like someone is trying to "backdoor" their way into the profession.
"Having an MFT-degree and thinking of this dissertation option;
would this be a route to do almost what one could do , after having received a clinical PhD?"
I seriously hope you are not suggesting that the only thing missing from a MFT degree is research and a dissertation in order to make it equatable to a Ph.D. in clinical psychology. If you think thats true, you are sorely mistaken.