Do you have copies of the LV2 manuals? When I've updated old LV2 programs to LV6, I have always encountered the missing subVI situation to some degree. A lot of it is due to changes made to make LV cross-platform in LV3. I end up looking at the functionality of the lost VIs and find/build a suitable replacement.
The 'DAQ_xxx' are the only ones in your list that I could find in my old manuals (LV2, Mac, Feb 1992 edition). Info is attached.
It is possible that some of the other VIs were actually user VIs. If someone goes to backups of my LV2 programs from ages ago, they would be missing a large number of core/utility subVIs. They were common to many programs and are in a separate backup.
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Fading out. " ... J. Arthur Rank on gong."