I have a 113.27520 which originally it uses a splitter as a safety feature against kickback.
So I wanted to make it safer and designed a prototype of a basic riving knife.
The knife stays at a fixed distance from the arbor. It is not fully lowered below the table surface but if you do such a mod then you can prepare 2 knifes, one tall and one short and use the one that suits the job.
I know that it is not the best but it shows it is possible.
This is a 2 hour work just to test if it is possible. I have solved all issues with the installation in that specific model and I think it will also fit many other models based on the same and similar structure making them safer.
Here is a video of it: