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Hi Nicoh

Just a suggestion for the future.  Don't agree to deadlines until you have a tired and true workflow that you don't have to create on the spot.  It will avoid panics and get you to running your business operating closer to grace and ease rather than operating in crisis mode.  Just a suggestion.

In photoshop, you need to create an action that you call within the Batch program. Here is a link with an example of how to do this: https://www.dam-photo.com/how-to-use-photoshop-actions-to-add-an-exclusive-border/

There are many more links on the internet that you can google.

Also, this can be done with a plugin to Lightroom quick and easily with a plugin.  Mogrify 2 is the plugins name: https://www.photographers-toolbox.com/products/lrmogrify2.php

It allows adding borders in the export panel (exterior or interior with all borders same size, unique size and whatever color you desire.  Easy to use and many other great features too.

Hope this gets you going and other forum members may have other approaches as well.

John Wheeler