I was eager to try this again with today's new release 18.104.22.1687.
Used the same (extended) profile from 14th Feb, using Normalise code range, Normal range, Hybrid option. Instead of hanging, CS quickly said "Error: "No primarys and/or white found" (sic). Much better, thanks!
I then manually added video-level red, green, blue measurements to my test "virtual probe" version of the profile, resaved, and retried. It created a Hybrid LUT with no problems.
So it looks that you can now use a Focussed patch set Exported in "Extended mode" to a LUT with the Hybrid option, as long as
you manually add video-level red, green, blue and white to the Focussed patch set afterwards.