On the other hand, if a student is used to having an out of trim a/c it may be less of a problem.
So your going to train them to fly in a manner which encourages unstable approaches and increases the chance of a go-around so that they are used to flying in a configuration which is not normal.
Instead of teaching them set that power, nail that attitude reconfigure while maintain that attitude and trim as required.
Its no wonder trimming an aircraft seems to be a forgotten art these days.