FEATURES: Works on blendshapes, fully mirrored nodes and multiple driven objects. Driven attribute can be changed.
INSTALL: Paste the "ny_copySDK.py" file to your "\maya\20**\scripts" folder.
HOW TO USE: Run this Python code: import ny_copySDK;reload (ny_copySDK)
Select the driver attribute from channelBox and click set on it's respective box. Same for the new driver attribute.
Then enter driven object keywords to replace: L > R, index > middle, etc...
You can also replace driven attribute names if you want to.
(It runs with 2017 and newer versions)