Jack Van Bebber and Conrad Caldwell were both undefeated for their career and 3X NC at consecutive weights at Okie State (A&M). Gonna be hard to beat that.
It doesn't answer the question asked. If we ignore the "D1 podium" part of the question, then John Peterson has to be mentioned. 1X NAIA placer who then became an Olympic Champ, Olympic Silver, World Silver, World Bronze
Do we count David Arndt? I can't tell for sure if they seeded the 1946 NCAAs. He was a 2X returning champ and was placed on the end of the bracket. In 1941 and 1942 he won it as the #1 seed.