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    $\begingroup$ The method based PositionIndex seems to be still several times faster. And it saves the generation of the long list of associations in the first place (which definitely does not come for free). $\endgroup$ Commented Dec 28, 2019 at 15:56
  • $\begingroup$ @Henrik I chose only to seek a faster Merge alternative because it seems to have a significant performance issue. I did not try to include your method because it was a way to avoid the Association creation in the first place, rather than speeding processing of existing Association data. If you would like me to try to include your method I shall, but I will be starting with the same Association data because that is my interest in this question, even if yours is the better answer. $\endgroup$ Commented Dec 28, 2019 at 20:27