While the concept of how to play didgeridoo is quite similar to that of the trumpet, it misses quite a lot. It might be closer to the
tuba, but it still misses by a bit.
One subtle but important difference is that when playing an instrument such as the trumpet, correct technique involves not puffing out ones
cheeks.
Dizzy Gillespie, however is an example of a famous trumpet player who broke this rule. The trumpet is also played with a far greater amount of tension in the lips, helping the production of higher
frequency sounds. A didgeridoo player also produces many different sounds and tones by merely changing tongue position and throat
aperature, where a trumpet player changes pitches using a combination of airspeed and valves. When playing a song on the didgeridoo, it is done all in one breath, through the use of circular breathing. While circular breathing is done on the
trumpet, it is not necessary to play the instrument
As one additional note, the didgeridoo is
traditionally played by men, and some aboriginals find women who play offensive.
In response to the
pipe dream, you might be able to simulate the
aperature sufficiently, but it will never have the resonant properties of a hollowed piece of
eucalyptus. It's almost like saying, yay, I have a
keyboard going to a plastic box. Sure, you can play with it, but you won't accomplish much.