Hi Felix,
for second script you need to firstly open RealityCapture application and then start adding the images into folder. Also, you need to have the script next to the folder of image folder.
If you have ENT license you can also use Real-time assistance: https://support.capturingreality.com/hc/en-us/articles/360018842059-Real-Time-Assistance-feature-in-RealityCapture-1-1-1-Blaze