@wild-bill said:
The production I’m helping out with has around 150/200 images and circa 30 videos
If it's that many photos you may want to just go the route of editing. I have a penchant for wanting flexibility and often try to solve things like this programmatically (assuming there's a reason to do so).
If it was only a handful of images you were using, then my method would allow you a lot of flexibility in terms of being able to re-arrange your images on the fly while looking at the video output to make sure they were ending up where you wanted them on the set. However, with so many images, it's probably not a sustainable solution.
Best wishes,
Woland