I was able to figure out the answer to this question. Though if others come up with a more creative solution, let me know.

My flaw was that I was looking looping in the Coil:Heating:Water component for a method to connect to a plant loop. Instead, I needed to look at the plant loop and use the addDemandBranchForComponet(coil) method to connect the coil on the demand side of the loop. method.

Here is a python juyter notebook with the method applied: PythonConnectReheatCoilsToHotWaterPlantLoop.ipynb