Rugerforum would be a good place to ask.
My gut feeling is, you're going to need a new slide in addition to whatever else you need. Pics I see of the DAO show no hole for the safety lever.
"As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven. "