I’m not expecting him to be Santi-levels of ambidextrous after a couple of training sessions or anything - he just needs to be a little more willing and ready to use his right foot if that’s where the opening is. Make himself less predictable. That ability to keep opponents guessing and act quickly and decisively is worth more than all the tricks and step overs in the world.
I remember them highlighting something in the pre-match warm up of Arteta’s first game in charge, where he had Nelson practicing cutting onto his left and getting shots away quickly from the edge of the area - sure enough, he did exactly that in the game and we got our goal from it. Wasn’t a brilliant connection as it happened - took bit of a deflection - but it was enough to force the ball through to Auba’s waiting feet. If he was drilling that into Nelson from game one then I’m guessing he probably wants the same from Pepe?