Very interesting experiment, thank you for sharing!
I would love to try copilot for myself and see the extent to which it can automate repetitive code patterns in a larger code-base. I'm guessing this is where we'll see the most value.
It is very tedious if it can only used on a file-to-file basis, but it's going to be a completely different game once Copilot is able to take the whole codebase into consideration!