Might need to go for something like an endurance frame, that have a bigger headtube and a shorter top tube.
Bear in mind that the SMP saddle would need to be set 10-15mm forward than conventional saddle due to sitting differently on it.
If you really want to change setback get the cheap Kalloy one to experiment on for now.
+1 to ed's suggestion - but hey bikes are a hundred year old invention, so you'll get lucky no matter what you choose out there [almost].
@Thuekr started
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Might need to go for something like an endurance frame, that have a bigger headtube and a shorter top tube.
Bear in mind that the SMP saddle would need to be set 10-15mm forward than conventional saddle due to sitting differently on it.
If you really want to change setback get the cheap Kalloy one to experiment on for now.