Add Bank icons to the Compass?
 

Are there any existing addons that can be configured to add Bank icons to the Compass?

Harven's Custom Map Pins perhaps? Or did you want something with the locations pre-loaded into it?

Something like how LoreBooks addon can track books on the compass.

I have not found any addon so far that knows all the bank positions yet, and shows them at the compass.

You could use Harven's custom map pins and create a pin at each bank (where you want it to appear at the compass) manually. This way it will be shown at your compass.