Vinicius - Benzema - Mbappe look perfect but Lewandowski instead of Mbappe hmm not sure if that will be good for Benzema since his role will be to assist him like what he used to do with CR7.. After this excellent season for him, everyone will think that he dropped in performance.
If Benzema isn't positioned as a CF, doesn't mean he only can give assists. It is the same as when he is positioned as a CF, doesn't mean he is only ordered to score by the coach. A CF also needs to deliver assists if another player has a better position to score. And there are many wingers that have more goals than CF, Son and Salah are the best example of this, both of them aren't Centre forwards. So if the formation: Vinicius-Lewandowski-Benzema, won't decrease the goal productivity of Benzema since he still has the same chance to score as usual. Of course, he still can have another amazing season like what he did in this season, don't worry.