If there were to be a change, it would be in OE, not IC, because the work is done there.
Since there is a 0% chance that a change for this update to functionality could be done by January 1 for this client's workaround, perhaps you can import Special Prices for them with the new pricing scheme, and use the functionality that is already in OE for always use special price? Do they use special prices already?
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Regards,
Softrak Tech Support