Great question — answering as the UphillTech team:
Profile Designs used to make an angled seatpost, the Fast Forward which, by angling the seat post above the insertion point, would set the saddle 43mm forward (according to the specs at the above link). While it appears they are no longer making these, it may still be possible to find dealers that have inventory, or find one on the second-hand market. Thomson have a "setback" seatpost that can apparently be mounted in reverse, though possibly because that's not the intended use, I can't find any specs on how much that shifts the saddle forward. Thomson does say it should be possible though (quoting from the product page above): Can I flip my set back post around to be a "set forward" to use...
Full answer by DavidW: https://bicycles.stackexchange.com/a/97040 (CC BY-SA 4.0).
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