If SOMEHOW a character was able to mimic dread Counterepell then yes they could.
No they couldnt, unless the character was somehow able to know a spell was being cast.
The character doesnt know a spell is being cast, when it is being cast without components. There is no trigger for that characters reaction.
It's no different from a trigger of 'when I see an enemy, thinking about his Father.' Unless there is some clue that the enemy you can see is in fact, thinking about his Father, your reaction never triggers.