I doubt they want him. Best case would be Ball to 3rd team and 3rd team sending assets to OKC.
But CP3's salary is just too big. You'd have to move Ball plus Redick plus other stuff. Or Ball plus Jrue.
My pipe dream is that some team is about to give FVV 20-23 mil a year and Toronto doesnt want to match that because they wanna save space for Giannis. So then Griffin slides in and says, "Hey do a sign and trade with us. Get Lonzo back instead of nothing. You have him for a year and if you need the cap room for Giannis, dont offer him the QO. Or, maybe he takes off for you guys and now he is a long term piece. Better than getting nothing."
And thats how we get Van Vleet. A dream? Maybe....but I wouldnt say it is absolutely impossible.