How is that? TeslaFi.com has been there for ages. Many others exist. And Tesla actually improved API access over the years (can now use tokens vs. having to share your account password with the app).

This sounds a lot like abetterrouteplanner, which already uses the Tesla API. They even get daily supercharger availability information to handle any temporary closures.

A lot of people in the community use Teslamate and Teslafi. The Tesla unofficial API is actually pretty good too.