I’m in the same “boat” with one key. I’ve been searching and calling dealerships, but nobody has a listing for the metal key blank. A local locksmith tried to cut the key off a similar blank, but it wasn’t similar enough. Like you, the only thing I’ve found is to replace the ignition switch. I want it, but it’s not urgent for me, so I’m going to try some more locksmiths. Maybe one of them can do a casting for me. I’ll let you know what I end up with.