Air Niugini have been doing it for years. There is no problem with cadets in the right hand seat of Dash 8's. Straight out of flying school and into the Dash 8 simulator. You then do 500 hours of line training with a safety FO in the jump seat and then you're checked to line. This system works fine.
Not a great deal of fun for the safety FO's however. And then there is the problem of the new FO's not having sweet FA command time and so not being able to progress to the left thand seat.
Maybe they could do ICUS from the right hand seat? Don't laugh, it is happening!