Hi @stefan_u ,
Can you share the solution you’ve found?
Regarding your issue, I have a simple solution to suggest using the Easify Product Options app (Free plan available). It enables you to create frame options for your customers to choose from with ease 
.
Here’s a quick demonstration on how you can set it up:
- Create a new option set:
- Add an option to choose between “picture with frame” and “picture without frame”, selecting one among the 25 option types provided by the app. For example, you can use Radio Buttons, Buttons, or Switch:
- Finally, assign the option set to your relevant product(s), and you’re all set!
Give the app a try 
!