Are you asking if the SDS can be removed from both the gel and the protein while keeping the protein in the gel in addition to returning the protein to its native conformation?
If you are doing LC/MS proteomics work then there are a number of ways of removing the SDS from the gel involving electrophoresis of material into a stacking gel or extraction with ammonium bicarbonate buffer with acetonitrile followed by the in gel digestion. Is this your application?