If your client can provide you with a 30fps EDL, you can convert it to 24fps with Cinema Tools. That's exactly the job the EDL convert tool was designed to do.
Okay, 29.97 to 23.98, but you know that.
By the way, you can copy and paste the sound from the 29.97 to the 23.98 project so you don't have to conform the audio.
--Dan