Sure there is no reason you cannot measue the devices and see what their resistance is and then replace them with same value resistors but not sure if that neans much difference then turning the DTCs off

Not knowing a Trans am I do not know how much you have to also alter for if it has a column lock, lock for shifter, etc that a MM6 does not have

If still using a A4 PCM flash I would assume it looks to see if signals from shifter lock is there and is in park position so at the least you have to simulate that.

Whereas a MM6 has no shifter lock and only looks to see if clutch switch is open.