There is something a bit strange here. The M3W has car controls. It seems a bit stupid that someone who has a bike licence and has never driven a car could legally drive one. Needless to say it is also pretty stupid that someone who does not have a bike licence needs to get one in order to drive and M3W.
In Australia they have avoided this issue by deciding it is a car.
Vehicle categories
EU law divides motor vehicles and trailers into 4 broad categories.
Category L
Mopeds and motorbikes, as well as all-terrain vehicles (quads) and other small vehicles with 3 or 4 wheels.
Within category L, motorbikes are further subdivided into 2 groups (with and without sidecars). There is also a subdivision for mopeds with 3 wheels, which have smaller engines and lower top speeds than motor tricycles.
Category M
Vehicles with at least 4 wheels designed to carry passengers - essentially, cars.
What is needed is a sub-class of Category M for 3 wheelers with car-like controls.