With a T fitting on the cold inlet, and the hot inlet capped off.
or
The same supply line running to both inlet ports.
And setting the "mix temp" on the TS valve to what you want the diverter temp to be?
A simple TS valve is MUCH cheaper than a diverter valve for some reason...why wouldn't this work?
Obviously capping off the hot inlet would be easier, but I would have concerns about not having any water running to one side.(even though I can't tell you why)