I'm tellin' ya, man... a custom SA will solve ALL your problems. You can use the PDS shock, but pass it through the SA with the lower mount poking out the underside. Stock shock, stock rim, stock sprockets, stock gas tank --- all possible if you do the SA.
Also, don't sweat getting the wheel centered on the chassis too much: Airhead BMWs for years ran a 1" offset, and my beloved Honda Hawk NT had a 1/2" offset. You'll never ever notice it.