Seat position fore-aft should not really be used to adjust reach. Ideally you find your preferred position WRT the BB so that you are balanced and so that you produce the most power. THEN you put your bars where they need to be to achieve the right reach and drop by getting a frame with the right reach and using the right stem length. Stem length also affects handling, of course, so you don't want to the all extreme trying to force a frame to "fit".
So whether you need a zero setback post to do the above depends on seat tube angle rather than frame size. If your preferred position is really far forward you might need one.
You're aware that there are frame manufacturers other than Special-Ed, yes? Some of them likely even have 54s available.
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