Is there a practical way to convert a log potentiometer to an inverse log one?
You can do this by swapping the two outer pins of a potentio meter. 

For example, pin 1 is connected to 5V, pin 2 is connected to a transistor and pin 3 is connected to ground. Just swap the pins so that: pin 3 is connected to 5V, pin 2 is connected to a transistor and pin 1 is connected to ground.

Edit: as @transistor said: the control direction will be reversed.