Thanks a lot to both persons who took the time to reply.
What I did eventually was *not* a technical solution (which apparently doesn't exist anyway) : I plainly got in touch with the publisher, from whose online bookstore I had bought the book, explained that I was a very old technically disabled person (which is only partly true...), had just received a Kindle as a Christmas present and wanted to start using my device with this ebook but saw there was a problem - and God, how disappointed I was -, and they were nice enough to answer that yes, indeed, an .aclp DRMed e-book would not be useable in this context, and they refunded me. I then bought the same e-book again from a bookstore using the horrendous but for now cancellable Adobe DRM, deleted the DRM immediately and did what I wanted with the e-book.
Lesson learnt : now that new e-books (ie published after Jan. 3, 2023) are not deDRMable on Kindles any more (which used to be my way to do things), do not try to be "nice" to publishers by buying from them directly, but first of all make sure that the online bookstore you buy from uses a DRM system that can be deleted.
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