Someone from Larian mentioned the hypothetical possibility of a utility to convert a D2:ED save at the end of the Hall of Echoes into a DKS save at the start of FoV, but I don't know if they ever got around to devoting any resources to that.
In DKS you can create a new level 35 character at the start of the FoV section of the game. In this case your battle tower servants are picked randomly, but there are other NPCs that can perform those functions in FoV if you get ones you don't like (personally I didn't care for Allan's personality or Igor's voice). Other than that, you would be upgrading your equipment relatively soon, anyway, etc.
