Warning: long meandering, speculative "answer" (and it may not even directly translate to Lightroom). In addition to the already described good practices for portrait photos, there's another subtle aspect that pertains to situations "in the wild" where the white balance you want for the image as a whole doesn't produce very pleasing skintones. I find this a lot in golden hour outdoor shots, etc. and it seems to be a psychological thing whereby we expect skin tones (maybe on people we know well, especially) to be "consistent" in photos, and not colored by light sources in a way that we don't object to in other objects (artistic effects aside).
This sense of "consistent skintones" is, I suspect, one of the things that camera manufacturers put a large amount of effort into when it comes to their in-camera processing. In fact, this was initially the one aspect of (Olympus) camera-produced JPEGs that I was more happy with than I was with what I could produce using darktable. Between that, and the fact that straightforward RAW development was able to accurately produce shades of orange that had always been a little too red in the camera JPEGs, it became clear that there was some fudging going on with colors that were just off of the "nice" hues (which vary surprisingly little among lighter or darker skin tones). After some messing around with the "color zones" module in darktable, I eventually came up with something similar (with the advantage that I can disable it when I want to) based on the following very slight tweaks:
- slightly increase saturation of the "nice" hues
- slightly decrease saturation of the adjacent "off" hues
- slightly shift the hues of these same "off" hues towards "nice"
all of which is constrained to a range of midtones where it seems to make the most perceptual difference, with the minimum effect on the image as a whole.
I'm blabbing about all of this because you mention playing with HSL values, and this is just basically a more refined way of doing this that can leave the overall colors of general images intact, without having to mess with portrait-style masking, etc. The effect is subtle, but it's as close to a "set-and-(mostly)-forget" operation without objectionable side effects that I've been able to come up with. If there's interest, I'll post the darktable style somewhere. It would be interesting to see what variations of it other people found pleasing, if any...