The process I have followed to simultaneously generate active and reference readings on the same panel is described here: https://www.avsforum.com/threads/colourspace-cms-next-generation-calibration-thread.3049142/post-62763756 . I am not 100% satisfied as I could not find a way average the 3 RGBW readings.
Further the process is tedious.

It would be useful to have simultaneous probe readings (in configure matching), being executed also when using secondary execution.

I am using secondary execution for probe matching since long. Every time I use it I have to read my instructions, as the process is very tedious and easy to fail

It would help a lot a mechanism that disables, when generating measurements data, the fact that CS does not allow for recording patches having the same stimulus.