After a quick search, I then came across this ingenious flasher Grips of Luxyled.
After 3 days, the parts arrived well packaged. They are very valuable, super processed and have exceeded my expectations!
There is a detailed manual in German, the batteries are already in it, and the assembly is very easy.
The handles I find very comfortable and grippy, slightly thicker than the originals and the feel is good.
Operation is simple and works well with gloves properly.
The LED's are also good to see during the day and in the dark, the position and the direction indicators are an eye-catcher par excellence!
My girlfriend is now back satisfied and their work colleagues marvel building bricks!
PS: An external power supply over Dynamo is possible connections are available and cable optional.