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The ice sword combo would have been awesome... but I think it is indeed impossible. I checked the move in LF2 SWU's Freeze and the move was an extension of his DvJ, the move where he's pulling the sword 
So we'll have to think of something else. Maybe a melee combo where he punches the opponent upward at the first hit and throws an ice ball on the ground that creates 1 column and freezes the opponent?
@Ariel: I don't know about removing the undershirt only. Makes him look like a stripper
Shirtless would be alright, yet a but plain; a dark tanktop might work but maybe isn't very Dennis-like. I don't know yet 
So we'll have to think of something else. Maybe a melee combo where he punches the opponent upward at the first hit and throws an ice ball on the ground that creates 1 column and freezes the opponent?@Ariel: I don't know about removing the undershirt only. Makes him look like a stripper
Shirtless would be alright, yet a but plain; a dark tanktop might work but maybe isn't very Dennis-like. I don't know yet