I like the idea.... but this doesn't make sense. I'm all for not using Google Analytics- I don't use it on my site. But why would you then use Google Sheets to hold the info? That's ridiculous. That's like telling people how to make an apple pie without sugar, and the last step before baking is dumping in a pound of sugar! If you want an easy data store, use something like SQLite. There are plenty of options that are…
It's not really a hard requirement for me to get off Google though, just to avoid using their ad-tech. For privacy concerns, using Google Sheets isn't all that different from using MySQL on Google Cloud, etc.