I don’t think you can call the clockwork one with your Python script regardless of the clash with Rhythm. This is because clockwork is not a core node.
The quickest way I think to handle this is to credit Andreas as much as you can and reuse his code.
from Autodesk.Revit.DB import *
items = UnwrapElement(IN)
#This portion would not be possible without the great contributions by Andreas Dieckmann and his Clockwork Package. All code in this section is from him.
typelist = list()
for item in items:
#Concludes the portion of code that was used from Clockwork
OUT = typelist