Hi Frank,
Same problem as me, but in thirty years time, I guess it won't be bothering me.
If you do a web search, on say 'exif file sort' You'll find plenty of free sorting programs which will probably help to generate a meaningful name which can then be sorted by Flashpipe. You need to test them out first, on a small set of file copies, and be aware that they most likely take a long time to sort a number of images, but you may only need them the once.
Best wishes,
Ray