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I'm not entirely convinced that the thing monitoring the pack needs to be entirely isolated from the pack. Are you assuming the 12v converter is isolated (also expensive if so)? From what I gather the system needs to be isolated from the frame most importantly, so the frame doesn't act like a big antenna/ground loop, but if the controller and monitoring and charging (and lights and etc) are also referenced to the pack with no reference to frame, excepting for shielding, then no big deal.
So if your cheap non-isolating 12v converter is referenced to pack ground, and you make sure everything that depends on it does not reference frame, then the whole thing can "float". Which is probably something you should do with a non-isolated 12v converter anyway.
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