It's worth a try but it may not work out. I used the data card key code to order a set of keys for my 230SL from Tom & Woody at the Classic Center, Irvine, California. Only one key worked, likely because the other locks had been changed out by a previous owner. Email thomas.hanson@mbusa.com
I don't remember the price but it was reasonable, and I received them in only a few weeks (US to Australia).
I forgot to add - the ignition barrel, and possibly the other locks, have codes stamped into them. But I think they have to be semi-dismantled to read them. Perhaps just order from the data card and hope for the best.