Coming back to report.
Scavenging the net I've found essentially three set of connectors between Redis and LV:
what can be downloaded from https://forums.ni.com/t5/Example-Code/REDIS-database-LabVIEW-toolkit/tac-p/3508611 taking into account the corrections listed in the thread. This seems to be the more widespread, considering even that it was shown as an option at the CERN LV user group this year (see https://indico.cern.ch/event/1388470/contributions/5911487/attachments/2843544/4971934/lugm_LabVIEW_at_CERN.pdf, slide 22). Dates originally to 2014.
Nick Folse's https://github.com/tauterra/Redis-Client-for-LabVIEW of about three years ago, according to its author no further developed. Found a couple of flaws, easily corrected.
https://github.com/Bas-vE/LV-Redis , which claims to be an evolution of 1., promoted to LVOOP. Most recent of the three.
The philosophy of the three toolboxes differs somewhat from one to the other, the first one being more of the kind "one VI for each Redis command", the others putting perhaps more the accent on the transaction protocol than on the completeness of the commands implemented. Redis's huge command set also expanded during the years in question. However, I found in all three something which looks to me a bit of a no brainer, which is that TCP client connection are opened and then closed for each elementary operation. While that might have a minor performance impact, I found that the approach prevents Redis' MULTI pipelining.
I have forked 1. in https://github.com/EastEriq/redis-in-labview and 2. in https://github.com/EastEriq/Redis-Client-for-LabVIEW for dwelving into. Finally, I have resolved for adopting my fork and augmentation of 1. in my project, but only after I modified it so that TCP connections can be kept open throughout the client sessions.