that looks cool, i don't know if you can do that on fl studio however if i would try to do something like that i would use:
3x patterns or more
paint brush the notes
edit tracks on the play list
automate effects
and all that happens quick and simple if you make quick decisions at the end you have same results for maybe similar time, the paint brush is the cool thing on fl studio because you can brush the notes fast enough and there is nothing to complain about
however a different approach can lead to different creative ideas but i still feel comfortable with chopping different patterns on playlist and i dont know if i would consider that