Replace default Entypo Fontello SVG icons in Easy Slider and Content Slider

Hello Kriesi Team,

I would like to replace the default Entypo Fontello SVG icons (Prev / Next arrows) used in the Easy Slider and Content Slider with my own SVG icons.

A custom SVG icon set has already been imported successfully and is available within Enfold’s icon manager.
A child theme is active and I can modify the functions.php file if needed.

What is the recommended and update-safe way to override these navigation icons in the sliders?
I could not find a suitable hook or filter for the slideshow elements.

Thank you for your support and clarification.

Best regards,
Mischa Spörer