Hi David,
I have experience with google apps script, google app engine, google API's, python, etc. technologies
For particularly google apps script i have knowledge of spreadsheet reading, writing, google api's use, predefined trigger and custom trigger for google apps script, form related classes.
So using these experience i can easily develop script for you.
I believe in long term relationship so after completing give best support for kind of small changes.
My more portfolio was on upwork.
Hope positive reply will get soon.
Thanks.