Duplicating old negatives

I've a large collection of antique negatives. I want to make dupes to avoid
handling the original ones (whithout using digital devices), and the Kodak
Professional B&W Duplicating Film 4168 (also called SO-339) seemed to be
ideal for this purpose. The problem is that this film has been
discontinued, and my question is if there's some similar film still in the
market. I liked the 4168 because it can be worked whith safety light; other
options are Kodak TMax developed whith reversal kit, and Agfa Scala
reversal film, but both have high speed, and have to be operated in total
darkness (not very confortable for making contact slides). I would like to
avoid the 2 steps techniques (original negative-positive-negative).
Thanks for your help.
Bernardo

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