Upload & Sell: Off
I don't think you'll find many professional studio photographers, if any, that use an expodisc. The majority use a Colorchecker type target.
The Color Checker Passport into your workflow and this is a non-issue.
Irregardless of the heads being used, indoors or out, your color is only as good as the weakest part of your workflow. Be it monitor, camera settings, large pieces of ONE color taking up the frame when shooting... All of that.
With producing the DNG file and applying that in your RAW conversions, Bob's yer Uncle my friend. But haggling over 100 degrees +/- and using a white disk to obtain reliable color (under any condition's) is really kinda crazy... IMHO