Unfortunately, there is no way to import your character from D2:ED into DKS or the Developer's Cut release. The original D2:ED saves are not compatible with either, just the separate release of FoV (which, as you found, is not available any more) installed along with the original release.
You can start a new level 35 character at the beginning of the Flames of Vengeance section of the game, though. You wouldn't have the same inventory or equipment (though that would be upgraded relatively soon anyway) and the battle tower servants would be chosen randomly (there are alternates in Aleroth), but could otherwise recreate the character.