You can't visit India on a tourist visa anyway because of COVID but to answer your question, yes, you might be able to submit a visa application. You'll have to do this along with your surrender application. And there is no such thing called "OCI sticker". OCI is a booklet and looks like a passport with 4 pages. If you apply in Canada, your OCI will be sent from the consulate here to BLS and you will have to either collect it from them or get it delivered to your address. I don't think BLS will ship it internationally.