OINP International Student stream is not part of Express Entry stream. While filling the Express Entry profile, when you are asked if you have been nominated by any province, you have to say "No", and when you are applying for PR, mention that in an LOE that you were nominated by OINP but for international students stream which you can't claim the points for.
I was nominated by OINP International Student Stream as well, and I did the exact thing that I wrote here, got my COPR a couple of days ago.