Why would the converter clutch be ruined by "towing in overdrive"? You open the throttle enough, the converter clutch disengages. That does build a lot of heat in the converter, and eventually overwhelms the coolers--the whole trans gets hot.
If your converter clutch doesn't work, I'd be looking at the control system first, before I swapped converters. Brake pedal switch adjustment, fuses 'n' wiring, the TCC solenoid, etc. I know a guy who overhauled his automatic-overdrive transmission, and the converter clutch wouldn't engage. He forgot to put the O-ring on the trans input shaft. But you won't find that problem without pulling the converter off the shaft.
Does the scan tool show the converter clutch is commanded "on", but it doesn't actually engage? Or is the computer not commanding the clutch to