Here an idea...

What causes the PCM to know something is bad with the transmission?
Faulty solenoids
faulty thermometer
faulty pressure sensor
....

What if I connect dummies (resistors and / or solenoids) to the A4 wires?
Will the PCM just "think" everything is fine because of the dummies and allow me to use the M6 troublefree?

OK this is a junkyard-mechanic idea, but why not?