As I said before, next season should be the transition season from Lewa to a new striker. Get a new CF, ease him in and rotate with Lewa. Tell Lewa that he can stay as a backup for a couple of years after 2026 if he takes 50% pay cut (we can't cut more due to the Spanish employment laws).
That would be an ideal scenario. And we are not getting Isak. If he is happy in Newcastle, there is no chance in hell.