When you say ignition switch, what part are you referring too?
Apparently the tumbler itself can be changed. I talked to a locksmith today who had a machine that can recreate a 'new' key from a worn out original. He showed me how they come apart, not hard at all.
He said if the key didn't work out he can change the tumbler (guts of the switch) and key it to the original key. This is for the 'UK' Legend, the new key works fine.
About $30 if I carry the switch in to him.
I thought you had to buy the whole switch.