Can't the sensor be relocated instead of building a new magnet/prop adapter. If i move the sensor about 22 mm to get the trigger point moved from 53 to 30, one screw hole is usable and the other could be tapped to fit the stock sensor wings. It appears the alum body is thick enough for a tap.
I am also thinking about 3d printing a new retainer for the sensor to reach the 30* BTDC set point. That doesn't address the magnet to crankshaft offset issue. I looked at the morrisminer option but there is no info about what issues he has corrected.