Replace the stock buttons with your own pictures.

Use SVG icons for customization, e.g. from https://pictogrammers.com/library/mdi/

I made the stl using https://www.tinkercad.com/ it's free and super simple for this sort of things.

The model is really a work in progress that I probably won't improve. To make it work properly I did a bit of post processing with a lighter a paperclip and a ronded screw. Works well enough for me. Feel free to improve.