Updating an excel xmlsm file with VBA macros using Python

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Python3.6

I have been supplied an excel XLSM file that has been built by someone else and has vba macro's.

I am wanting to populate data into the fields of the xlsm using python.
There are a set of field names such as CustomerName, Address etc.

What I want to do is create a new xlsm from the original sheet, then set values such as CustomerName and save to another xlsm file.

I have made an attempt using openpyxl below. I am wanting to know if this looks like a good approach and also wanting to know how I update the field CustomerName

What I have tried:

I have tried using openpyl as follows

from openpyxl import Workbook
from openpyxl import load_workbook
wb = Workbook()

customer_name = "dave"

# and the workaround
wb = load_workbook('ANZ.xlsm', keep_vba=True)
sheet = wb.active
sheet["CustomerName"] = customer_name
wb.save('ANZ2.xlsm')