There's nothing trick here but I found a pretty nice heavy duty chrome seatpost, there's gotta be an easy 8" in the frame and it still seats a man size on a boys frame. 30" from crank center to top of my seat fits me in any position. Recumbent like Harlequin or vertical like this. Won't get the cool votes from guys that don't ride their bikes but I've yet to bend to convention. Why build a bike you can't ride has always been my motto. I may yet revert to the bent post but this one fits me...
GC.