That has never really worked out. Great ball playing CB’s we have had like Vertoghen and Romero have never been used as DM’s even in a crisis. On paper you would think they might be capable but perhaps the positioning and mentality is very different that it makes it not that workable. Off the top of my of head only a few CB’s have transformed into good midfielders like Declan Rice. Not saying it can’t happen but it’s not something I would bet on.