Have you tried a 'key cutter'? When I needed a new key for my Ford Fiesta (original had twisted due to a stuck boot look), they took the original one, scanned it using some machine, then programmed a new one on the same kit. First attempt didn't work and I could only start the car using the new key in the lock and holding the original one near the column, but I returned and they managed it on their second attempt. Cost about £40.
Wonder if they could produce you a new working key from the remaining one that works?
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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