I own a Zenith DTT900 Converter, along with a briefcase full of universal remotes. Most of the remotes I own do not work with the converter, but here are the codes and remotes that DO work that I know of: All are programmed under the satellite receiver button.
Phillips PM6225 6 Device Consolidator--Code 267, which is listed as a Zenith satellite receiver
Radio Shack Model 15-135 HDTV Pro Remote-- Code 01414, which is listed as a DirecTV satellite box code, as well as an LG satellite box code
Radio Shack 8-in-1 LCD Remote Model 15-100--Code 01414, which is similar to the model 15-135.
Zenith 6 Device Universal Learning Remote Model ZN620--Code 267, similar to the Phillips remote listed first.
This may not be a direct answer to the One for All remote you have, but the remotes I listed are stiil for sale as of 4/08, so at least you know some currently available remotes that can dothe job....