Hello Paolo,
Concerning the choke plate on the MVVS engine the opinions are of mixed nature.
Whilst it is easy to have one, it may also upset the carb mixture that was so carefully adjusted with the plane at rest.
That is due to the fact that the MVVS engine has the carby up front, and in an aerodynamical most variable position in front of the cowl and near the prop blast, all from an airflow pressure point of vieuw. This causes turbulence and pressure differences at the carb mouth and regulating membrane. The Walbro carb was not designed to cope with these variations.
Sometimes this location does not cause the carb mixture to be upset, and sometimes you get into deep trouble, and the engine may go lean or rich in particular flight attitudes.

One (of multiple) solution then is to remove the complete choke valve, and plug the shaft bores in the carb.
You then choke the engine exactly the same like a glow engine, like using your thumb. It takes a bit of practice to get the exact amount of choke required. Listen to the "hissing" of the engine after choking.
If thumb choking is not possible due to accessability, protect the choke valve from direct airflow from the prop

You too have a nice X-mas and a happy New year.