Some progress
I've made some progress on this. Screw-on replacement valve stems of assorted sizes/lengths are available as previously suggested. You need to cut the original valve stem off at the base just above the thread that secures the metal sheild. The replacement valve stem is then screwed onto this thread. There's a rubber washer that goes between the face of the replacement valve stem and the tube to create an air tight seal.
The down side for me at the moment is that the only replacement valve stems that my local tyre guy can locate at present are those used on earth moving equipment. They are a much bigger diameter than the standard valve stem (for increased airflow)... as can be seen in the attached slightly blury photo.
A quick check of the dreaded ebay suggests normal size screw on replacement valve stems are readily available from the US. Will do a bit more research but importing some replacement valve stems is probably going to be the solution.
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