PvE sparring/practice

My idea is for there to be an area in the barge (possibly same area as the pvp sparring area) where you can choose to fight against a PVE enemy where you have unlimited health and you can practice against certain enemies so that come mission time you are familiar with their move sets, etc.

During the beginning of the story mode I remember seeing the ship holding a dead carnifex or something as you walk into the armory area for the first time and with the addition of the pvp sparring area it reignighted this idea.

This way you dont have to get all the way to the end of an actual mission (lets say on a new difficulty you havent tried before) in order to deal with the boss.

Maybe make it so you have to defeat the enemy X amount of times in order to practice against it - this way it doesnt remove the first time excitement of going up against new enemies when they are dropped.  For example - you beat the a carnifex on substantial difficulty - you can que up to practice against a carnifex on substantial difficulty but not ruthless.

The prime use of this in my head is that so in order to get "practice" against the hive tyrant - i dont need to que up, make it to the end of the mission, and then when the stake of the mission rests on actually beating the boss - I can just que up to practice against the hive tyrant in a less high stake environment - so that when its go time on a real mission I am confident in my ability to handle the boss.

thoughts?