As GG already said if they time it right they can beat your DP. However you can delay in anticipation to beat or trade with their DP. That’s a bit too much thinking though and if you want to hit with the DP there are other setups.
Instead of a LK->knee bash you could do a couple of LK to put you slightly out of throw range. Now in order to throw you would need to walk forward just a bit. This is where the DP can play havoc with your opponent. Natural instinct for a player is to poke or counter throw when an opponent walks towards them. If you walk forward a bit->DP you will find it much like a psychic DP when you hit the counter.
It’s a decent option considering that if they do nothing and simply block Ken is fairly safe due to his fast DP recovery.
Basically the order of actions would be 2/3 LK->Slight pause(anticipating a counter DP, though you could skip)->walk forward a step->DP/or walk forward a step knee bash