You’re on the exact same tack as me on this one, Chris … the only difference between us is that I preferred the look of the v9 version.
I’m amazed & curious that very few other people seem to miss this this feature of Smart Lighting … and I’m astounded that it has been dropped from PL 
I’ve just come back today to rework some images that I had originally processed with Smart-Lighting mode = DxO OpticsPro 9 … and I’ve spent quite some time on them in PL - but with nowhere near as good a result as I originally achieved with OP … So frustrating and annoying 
Despite the lack of backwards compatibility between PL & OP, I wouldn’t mind if the algorithm(s) was resuscitated with a different name - perhaps as the “Brightening” mode (in keeping with terminology related to ISO Invariance) - - 'cos I suspect it was inclusion of “OpticsPro” in the v7/v9 mode-name that caused a marketing issue with the upgrade to PhotoLab (from OpticsPro).
Chris - May I suggest that you add your requirement for the v7 version of the OpticsPro mode for Smart Lighting to my thread (PL Smart Lighting has lost algorithm to process (purposefully) under-exposed images) - - - so that votes on this topic are not diluted.
Regards, John M