I can sympathise as I'm facing the same dilemna myself...
Look the truth is, INR Bank statements might be acceptable as POF...See here and here->
http://www.canadavisa.com/canada-immigration-discussion-board/landing-in-canada-all-you-need-to-know-t36735.0.html;msg4281476#msg4281476
http://www.canadavisa.com/canada-immigration-discussion-board/fsw-2014-applicants-timeline-lets-network-here-t276642.0.html;msg4333010#msg4333010
But the truth is, it's risky and most senior members advise against it...Not to mention CIIP, settlement orgs like Costi and most ppl I have asked have said that INR bank statements would be unacceptable...If by chance the POF is not accepted by the Officer at the Port of Entry, ur jeopardising ur landing for such a trivial issue...
So, unless someone posts an official source/ some senior member of this forum comes up confirming this with his/her landing experience, it's best not to take these risks...Be ready to absorb the exchange rate loss....Take the money in CAD with some amount as cash, some amount as Travel Card/ Travelers' Cheque and choose a good forex provider that gives u the best rates...That's all we can do...good luck!!!
(Also after u come back, u have upto 6 months to remit the unspent forex back to INR, so u can wait till the Exchange rate goes favorable)