Hmmm, I think I've got one of those little blanking plates for the headstock hole when you remove the steering lock.

Note that you'll have to remove the front end completely to get the steering lock mechanism out. And if I remember correctly you'll have to make a little jumper for the steering lock connector or you get errors. Not difficult and I've got one in my box. It can also be used for undoing the steering lock when you haven't got the card