The handle (mount) works great !!!
Requires minor modifications - One of the screws for the extruder (lower right) is blocked by the cable holder.
In the pictures you can see the corrected / cut printout of the handle without any obstacles.
I didn't extend cables to the stepper motor. Maybe with very high printouts there will be a problem but at the moment it's OK.
I can say that this is a modification that made me very happy. Now the prints come out perfectly. I changed the acceleration, of course, but the longer print time is compensated for by perfect quality with a retraction of less than 2 mm. ;-).
Here's a movie about how it works:
Thank you very much - MIJU