We use a similar method, but I pay for a Sheets add-on called
Chromebook Getter which enables the bulk upload/download process. If you pay for the pro version, you get the same capability for users which is also nice.
We use it less and less, though, for two reasons.
- We found that, while using the sheet, we essentially had two copies of the "truth," one in the sheet and one in the Admin panel. We didn't always remember to upload after every trivial change and this lead to all kinds of small (but annoying) inconsistencies. Plus, every once in a while, you can make a small error and, since it's a bulk tool, that small error can become a doozy. (Like that time I deprovisioned 200 Chrome devices...)
- We are becoming more and more comfortable using GAM for most of these management tasks. It's free and more capable (but, admittedly, much harder to learn to use.)
-SD