That sounds similar to the Mr Scotts Guide where the name Ti-Ho
came from. In the book the ship which was renamed Enterprise was a test bed for a Transwarp Drive system along side the Excelsior, the explanation being two competing companies were working on the project one of which was the manufacturer of the Constitution nacelles.
I can buy the idea that this could be a new ship built to test new technology in a proven space frame before being installed in newer classes, whether that include a Transwarp or a new Warp Drive system. That could attribute to some of the issues she had leading into STV.