Yes this can be done but it will have the following difficulties,
1.To line up the coke drum in blowdown tower with MP steam (14 Kg/cm2 g pressure) any mis-operation can lead to pop up the PSV of coke drum.
2.If the PSV’s lined up to fractionator then it can upsate the fractionator.
3.This will also generate the more sour water treatment of this will be another headach.
I hope this will clarify the issues.