If the book has chapters/sections, you could use them instead of page numbers (still the links should point to the right place in the text, not just to the beginning of the chapter). If there are several occurrences in the same chapter, you add letters, like 1-a, 1-b, 1-c, etc. Or you could simply use some dingbat or bullet as a placeholder for the link.
A note of caution, when an index in paper says 354-7, it could be that a single passage that spans the 4 pages refers to the term, or it could be that there are at least 4 different independent occurrences of the term that happen to be in pages 354, 355, 356, 357. The former case would need a single link, the latter four links. Even worse, a single page number could actually hold several independent occurrences of the term, which would require several links... So, if you don't want to keep the page numbers, you'd have to practically redo the whole index.
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