Hi @Markku_H! Thank you for reaching out, and welcome to the community! Currently, there is no alternative method for restoring deleted photos without having them re-added to All Photos.
You can give this workflow a shot:
-Go to All Photos.
-Change the sort order (bottom) to "Modified Date" and select "Descending" order. Take note of the very first photo currently there.
-Go to the Deleted folder.
-Select ONE test photo that you don't mind losing or mixing.
-Right-click and choose Restore.
-Immediately go back to All Photos. Your most recently restored photo should now be the very first.
-Create an album (for example, recently restored)
-Go back to Deleted and start restoring in batches.
-Check your All Photos and move the restored ones to the newly created album.-
-Now you can export your photos from this album to your external SSD.
-Choose Original + Settings (this ensures you receive the raw file and any existing edits) or JPG if you only want simple backups.
Hope this helps!