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If it actually is coherent to speak of a "eudaimonic rate" of doing something to someone who doesn't want it done, I need to significantly revise my understanding of the word "eudaimonic".
I'm thinking that an eudaimonic rate of intelligence increase is one which maximizes our opportunities for learning, new insights, enjoyment, and personal growth, as opposed to an immediate jump to superintelligence. But I can imagine an exceedingly stubborn person who insists that they don't want their intelligence increasing at all, even after being told that they will be happier and lead a more meaningful life. Once they get smarter, they'll presumably be happier with it.
Even if we accept that Fun Theory as outlined by Eliezer really is the best thing possible for human beings, there are certainly some who would currently reject it, right?