It was mentioned earlier that it's not advisable to use a font that simply maps an entirely different character to a normal letter... in this case 'w'.
If the infinity entity doesn't look "right," keep in mind that the font used in the Book View of Sigil isn't very indicative of what it will look like on a reader. If it still looks "bad" in ADE, then embed a unicode font that produces an infinity character (using the html entity) that looks "better." (though I think it's a bit overkill to embed a font for a handful of special characters, unless there's absolutely no other way to produce them)
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