I have a more modest version of the OP's problem: I can't read a book on the Voyage at a reasonable size in the standard fonts.
I solved it by making all the text bold and choosing Helvetica (which is quite dark).
To accomplish this I use Calibre to convert the book to mobi (or convert the mobi "again"). Under preferences I selected "Common Options" and in the tab "Look and Feel" I typed the following into the "extra css" box
* { font-weight: bold; !important}
I hit "apply" and closed all.
Now all the text is bold in all my books. Of course, this makes it impossible to tell which text was originally bold, but I find I can actually use my Voyage this way.
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