My take on that is, if it changes down the road (the standard, for whatever reason), great, change the accursed things then. For the time being, like Occam's Razor, the simplest answer is usually the right one. Embedding symbol fonts for something that can be accomplished with plain old vanilla html is, I think, just over-the-top. PLUS, you don't have the pesky 1.05 epub validation thing to worry over, at least about this.
Good luck!
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