So, I managed to get the orange bugger to work like i want it to. I'd like to share with my solution for anyone having similar problems:

It actually is possible to work only with text and fix the inline forms correctly, preventing them from messing up the file if an operator wants to touch up your point. I wasn't quite sure if it would be a sustainable solution, since Kuka's file format still seems a little bit weird to me.

1. Taught base #1 and base#2 (welding tables)

1. Used the old program taught in #nullframe - transfered to base#1.

2. Transfered the programs to base#2 and translated among the base#2 -tables were not completely aligned.

3. Deleted the S&T Values, which prevented robot from executing the program in base#2.

4. Fixed welding process points to match the application.

Tools used: Winmerge, Find and Replace, Orangeedit. The welding process still needs a few fixes, but that is mostly due to mechanical work. Thank you guys for helping!