I asked the same question, given that mine had a broken piece of key corroded inside it, so now have a gleaming new unit to replace it.... It IS a lot of faffing about, given the steering stem is part of the top yoke, so major dismantling probably required. I was always under the impression the best way to remove roll pins was to drill them out, but that idea was questioned due to it's hardness, some suggested shearing it off by a sharp blow on the lock, but I ain't brave enough for that one.
Hopefully someone else will come up with a tried and tested method, I take a padlock and chain everywhere with me, but it would be handy to have this OE option at times....