With one armed biking, giving proper bike turn signals is usually not possible.

The trick therefore consists in a technical solution to indicate turns.

The product was bought on Aliexpress.

Overall bike setup as of now: rack with bag, and a provisional (not perfected yet) handlebar light.

My double cable brake lever and the two Silver shifters that I used to put the down tube shifters on the handlebar.

Also I put on new brakes : )

So far, so good.