Use a script with Insert field or insert picture to insert a single file from your folder with the "store a reference" option enabled.
Then have your script extract the file path from this container field, putting this path in a $path variable with the file name removed so that it is just a path to the folder.
Then use this $path variable with Import Records | Folder to import all the images in the folder.
If you set this up correctly, you get a dialog where you select one file from the folder, but the script then imports all the images from it, not just the one you selected.
This thread on file paths, path variables and container fields may be helpful: Exploring the use of a $Path Variable in Scripts