Fix the problem rather than converting (and losing data and time) messing with Lab. Too many are intrigued by converting to an exotic color space and changing the rendered numbers when the issue should and can be corrected while you render the initial data from Raw.
I will defer to your considerable experience and give the ACR calibration a try. I am all about better time management as I spend far too much time in front of a computer now.
When did photography become a desk job anyway?