bugdevheli,
The idea of a cheap trainer would make sense for any flight school.
The R22 is used 80% training, 5% private travel and the remainder pipeline patrol, police, etc.(ref.NTSB report)
My opinion: for training a high cruise speed is uneccessary.So use a big rotor and low power and make it very quiet.
Cicare has one.
http://www.cicarehelic.cjb.net/
slowrotor