Greetings,
You project caught my attention because I have experience in image importing using Excel.
Based on the information you provided I have developed a prototype, please refer to the video demonstration below:
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The functionality is very simple: You will enter the pictures in a list and configure the paramenters in each column (width, height, etc). When clicking import everything will be brought to current sheet.
At the moment I did not understand what you mean by each border column, but I am sure I can adjust it to your needs.
Thanks for the attention.