People who want to throw someone into the back row that’s never played there before make me want to scream. This isn’t 30 years ago where the second rower tucked the ball under the arm. The role of the edge forward has totally changed in the past 15 years.
They are now an integral part of either the left/right side structure. Their role in attack is to take late pass hit ups into a gap, draw in 2/3 defenders and get a quick play the ball for the next play. In defence the edge starts with them. They have to cover the half and make sure the inside stays shut.
The game is way too structured these days, it would him a good 2-3 years to transition his body and style before it would work. His strength is his running game, leave him where he can use it.