Aft fuselage static ports are not prone to icing, so there is no technical need to take advantage of the heated static port on the pitot tube. Static ports would ideally be placed in a location where the pressure was the same as the free stream static pressure - i.e. the pressure that existed before the aircraft came along. Wings, by design, cause the pressure to increase below the wing, and decrease above the wing. Thus it is difficult to find a location near the wing that will have the same pressure as the free stream static pressure over the whole flight envelope. The manufacturers that use under-wing pitot-static probes would have conducted a lot of flight testing, with probes in different locations before they found a good location.
I recommend you stick with Van's recommended static port design and location.
