While I love the FJ ships (after spending almost 50 years with them, yikes!), I'm not sure I would let those designs influence what is considered a scout class ship. From the few usages in TOS, scouts seemed to be relatively small ships.Franz Joseph gave us a scout class Starfleet vessel that was still quite sizeable given it used a same/similar saucer main hull as the Constitution-class.
For what it's worth, I think the Saladin is a great destroyer, but I don't think deleting a couple of phaser banks and the torpedo tubes is enough of a change to really be a completely different class.