How to re-house images in uploads/YYYY/MM

My media items are not stored in YYYY/MM subfolders of uploads. Instead, I had cooked up some scheme to ingest posts, but seem to have declined/neglected to organise them that way.

So, I've got a combination of one big uploads folder containing thousands of files, plus some specific subfolders in uploads, like logos, people, icons. That's because not everything is related to a post.

But the images that do relate to posts... well, they are disorganised. I think I wish I had used date folders - at least, for post images. Now I'm 9,000+ in.

The question...

Is there any option for automatically organising these in YYYY/MM subfolders as they should have been? Anything that will, for example:

• spin through the library
• if image is associated, check post
• get YYYY and MM of post
• reorganise image in corresponding folder

?

Some of my images relate to ACF fields.