best way to add repeated custom fields to widgets

Hi there

I am building a WP site that has several widgets of thumbnail images + related links, and I need to provide a means for client to add any number of image+link entries to any widget, and the styling to be image left, link right when published.

I guess I need a way to add repeatable fields in my widget admin – do I need to build a plugin for this, or are there existing plugins out there to take care of this. I saw Advanced Custom Fields, but this is probably too complex for my needs. I see many other plugins for doing this within page/post, but not widgets

Thanks for any help you can give.