Werner would be sick together with Lukaku and Lautaro if he wasn't Bayern bond… also his price would be tops 40mln. Euro which is basically a bargain nowadays. Him as a lone number 9 would be meh, but him with another proper striker alongside him would be lethal. Out of the list he is the only player I would be really delighted with.
With those rumors around Politano and Dimarco I also see Rebic as a real possibility, because half the transfer sum for him would go to Fiorentina. Rebic in my oppinion would be interesting if Jovic was available. Getting Rebic and Jovic together would be great, as they know how to play in a double striker formation and executed it perfectly last season. Dembele and Depay from Lyon can also be considered as an interesting duo, if they were available/affordable.
Last and biggest risk option would be Alfredo Morelos from Glasgow, who despite being very hot headed seems to be a lethal striker. Such a risky player has to be backed up by a safer option though (e.g. Petagna).