[spaceywilly]

This may be helpful. What you’ll probably want to do is make an image of your map and place it somewhere on earth in a GIS program, then your image becomes a custom map layer and you can add additional data to it.

https://rossthorn.github.io/interactivefantasymaps.html

[Otternonsenz]

This is very much up the alley of what I was looking for. Thank you!