It is possible but is out of the scope of my current project because CellWriter only recognises single characters.

The only open source ocr engine I know of that could perhaps be adapted and trained to recognise handwritten words is ocropus. When I or someone else gets it to recognise handwritten words easily and with a good enough success rate, I will immediately make it work on my n900.

Ocropus is built for linux and has great python bindings, but like
Wikipedia says, "OCRopus also contains disabled code for a handwriting recognition engine which may be repaired in the future."