Following that same vein on the RelicNews forum for redesigning Trek, here's the Klingon D7 and a conjectural F5 frigate.
TOS describes a few situations where a klingon scout ship is present. The F5 would fill this role, while also serving as a predecessor to the eventual Bird of Prey (possibly even replacing that design, since the BoP From STIII is supposed to be a Romulan vessel).
In my world, Disruptors are the Klingon Photons. They never had those things that they fired out of their navigational deflectors.