There is the occasional exception to every rule in aeromodeling.

Yes, an occasional person might get away with training on a jet type... but only with a good instructor, and even then, the average student would have problems.

The typical ducted fan or turbine powered model is heavy. That means it has to fly at higher speed, giving less time to react. I've run into a lot of students who had problems keeping up with an average trainer type, and had to be redirected to work with a plane such as the Dynaflite Butterfly (which is about as slow as they get) to get any progress.

In 30 years of aeromodeling, I've only heard of 3 people claiming to get anywhere using something faster than a "stick clone' as thier initial trainer... I've never seen it work, though I've seen it tried by several people who wouldn't listen. (I've seen a lot of trash bags filled too...) The potential cost of not succeeding when you disregard this advice can be very high... The DF jet models are EXPENSIVE. they can do a lot of damage to a car, house, person.... whatever they hit.

If you plan ahead and buy the better grade radio as the first system, then the cost of the trainer model and .40 class engine will be comparatively small. (you may find you enjoy flying that size too... and it costs less per flight to feed the engine.)

There's nothing wrong with having the goal of flying that high performance model.... Work to get your skills up to the needs of the aircraft.