No, it is not possible to convert the speed sensor on the rear wheel of your KTM Duke 200 (2019) into an ABS (Anti-lock Braking System). The ABS is a complex braking system that requires additional components, including specialized sensors, hydraulic modules, and control units. These components are specifically designed and integrated into the motorcycle's braking system during the manufacturing process.
Converting a non-ABS motorcycle into an ABS-equipped one would involve significant modifications, including replacing the entire braking system and adding the necessary ABS components. Such modifications are highly complex, require expert knowledge, and are not recommended as they can compromise the safety and performance of the motorcycle.
If you are interested in having ABS on your motorcycle, it is advisable to consider purchasing a model that comes equipped with ABS from the manufacturer.