When creating a PDF template can you lock down a choice of several images that a person can upload?

We are creating a graphical PDF template for use across our business. It's essentially a graphic overlay with the ability for a person to add a background photo.  We want to lock it down in a way that means you can only choose from up to 20 images to upload. The issue is we don't want to give the user the ability to choose photos from their own storage, but rather art-directed images we have created that suit the purpose. ie giving flexibility but limited.

Question: is there a way for you to basically embed a link where someone can choose only those images?  Is there functionality I'm unaware of that could do this in Adobe?