For various reasons, I was reluctant to do that. But I came up with another solution. Adding a map provider that supports a custom hosted service. In this case, a fork of a Static Maps API written 6 years ago by someone I know. You can find my fork here.
By using a self-hosted but external static map API, I keep the option out of the plugin for now. It will also work with anything that implements the same API.
In the same update, I also fixed a few bugs, and added moonrise and moonset calculations, which display along with sunrise, sunset, and moon phase in the Last Seen widget for now.