Just a couple of thoughts about the steering lock... I have never seen one break as described. That's not to say that it couldn't or hasn't happened, but it is as well made as that found on any other American cruiser.
Possibly, the ignition switch tumbler has been replaced by a previous owner. Early in the life of these bikes, before we understood how to improve their reliability, many bikes suffered broken ignition switch brackets that led to the destruction of the butterfly part of the switch and subsequent loss of the tumbler. The fix was to replace the tumbler (with new keys of course) and install a beefier butterfly, and bracket.
The steering head lock is more difficult to change and so many owners just lived with two different keys in their pockets, the new one for the switch and the original key for the steering lock.
We've sold and repaired many of these switches over the years and may even have worked on your new Excelsior Henderson. If you are curious, give us a call or send an email with your serial number and we'll check our files.
Ride Safe,
Jamie Jones
Atlantic Excelsior Henderson
540-298-9310