You maybe could use my module FieldtypeSelectExtOption in this case. install module create a field with this Fieldtype go to details tab of the new created field choose your preferred Inputfieldtype select the field holding your images as 'Source Table' save field select 'sort' for option value and whatever you want as 'label' set ther filter to 'pages_id = 1234' (1234 is a placeholder for the pages-id holding your image field and repeaters)
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