Since there is no out-of the box solution and not a single internet-thread on this topic i had a hard time completing this step and therefore the lack of updates. It seems just a turn signal switch assembly, but i spent several hours on this one to finally get a clean and well working result. And had to buy several stuff while doing it so that allways gave me a little break inbetween. Anyhow here is how i went:
After four attempts i managed to remove one of the four plastic handles (the last one) which i had without braking it – success!!
Wasn’t able to find anything near the original brass thinky to mount the handle back into the base so i got a little inventive and used brass nails istead. Looks like OEM, fits perfect and is more stable than the original design: