Update: The backup sensor has arrived, and looks pristine. I will start work on it tomorrow - yes, I will be debayering another one; after all have made the investment in narrow band filters, and the filter drawer so I should give it a go.
I have also picked up another 450D body off ebay, which I can use as a parts donor or move over to if I have a problem with one of the other cameras. The problem with working on these things is that taking them apart and reassembling does put some stress on the ribbon cables and connectors, so having a body with no 'mod history' is prudent.
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