In the final version I also drew diagonal cuts towards the adapter corners so that the two inner pads have a larger, triangular shape, which is much easier to handle.
Here's a SketchUp of the chip and extender:
Got the picture now? And, by the way, it works as expected! I soldered the SOIC8 with a 0.6mm RoHS Sn and 15W iron (1mm tip or so). No flux, no other helper: just a steady hand, a lot of patience and some luck.
