Job done! Thanks to info from both responses I have just finished installing the seal with the help of a blunt screwdriver. The rubber was robust enough to withstand the treatment. I joined the two ends together with a bicycle inner tube repair patch and then filled the join off on the outside with black polyurethane sealant. I have not bothered with the staple that the service manual mentions. I'll see if that's necessary when the windscreen assembly is offered up to the 403 when it comes back from the paintshop.
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