Moving on from trials, all seems to be working well now.
All visual testing in Google Earth.
Discovered that Photoshop CS6 has a Perspective Crop Tool which does exactly what I needed. Crops and straightens in one go.
Done two map areas this afternoon. Looking good enough for my needs. Joint between the maps is visible but good enough.
This is the kmz in Google Earth. Retaining long file names since it seems to make no difference in GE or Etrex 20
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