I was on the path to make an app to help with image grouping and stumbled upon another solution.
I’m well into QGis and found a function there that can pull exif data with gps coordinates from images. That combined with other functions I already know gave me a solution that can make a image grouping file with not to much effort.
The steps:
Toolbox->vector creation->import geotagged photos
Import GCP’s from CSV
Create new polygon layer and draw your polyogons choosing an polygon ID coresponding to your group name.
Do a spatial joint with the image layer giving every image a group name. Export to csv and remove unneeded data.