As long as the links are within the epub (and not to some external source) it would not worry me too much. The few illustrated epubs that I have generally manage to satisfy attribution requirements via a "List of Illustrations" (each item in the list links to the image, but the images don't usually bother linking back to the list). The list of illustrations typically goes at the front, but if it is going to be very long then you might prefer to move it to the back.
Example from my copy of
The Concrete Planet by Robert Courland:
Quote:
List of Illustrations
[...]
Figure 7. Bust of Cato the Elder. Image courtesy of Wikimedia Commons.
Figure 8. Vitruvius presenting his book to the emperor Augustus.
Image courtesy of Thomas Gordon Smith/Wikimedia Commons.
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In each case the "Figure n." text is the link to the image.