I have the same difficulties especially with larger areas where all three channels are clipped.
Here is the demonstration:
This is how the scene looks with a correctly exposed photo:
Here is an overexposed one with corresponding intication:
This is how it looks without highlight reconstruction:
Highlight reconstruction with LCh.
The overexposed area of the wall under the windows is too bluish but overall relatively good reconstruction:
Reconstruction with guided laplatians all values at maximum:
Note that we still have magenta on the wall.
Guided laplatians on maximum and reconstruction in Filmic. This is the best I could do with it:
Reconstruction is a little better if internal iterations in Filmic are set to 0:
At higher values the color of the frame bleeds into the wall I guess. The color of the framework confuses the results, since it is very close to magenta:
I get the best results in this case as a combination of reconstruction in LCh and Filmic:
Here is the file if you want to try it yourself:
DSC_2319.NEF (28,6 MB)
Edit:
I just did another test, and the best result with Guided laplatians in combination with Filmic is now this:
For Guided laplatians I chose default settings again.