There's 2 parts to the key. The physical blade with its machining's, and the chip within. You can extract the chip from the wrecked bike's key and place it into your original key so then you dont have to replace the physical locks on your bike.
There's probably some risk to downgrading the computer to an old bike, but I'm sure there's nothing that cant be overcome with a little persistence.
Do you get the complete wreck, or just the computer and key?.
I've actually got an ECU and ABS computer from a 2005, but no key. I thought I had a solution to my own 2002/3 ST1300 that has the FI problem, but the 2002 style ECU's have different connectors and I dont have ABS.
I found out that there is a guy in Melbourne who can program a key chip if you send him the ECU for just $500.