Funds in your wife's account should be enough considering, she is coming with you. I guess you'll have to furnish marriage certificate, a letter from bank and 6 months bank statements. Be assured, CIC requires funds to be liquidated at any point of time, if need be. Hence, I don't think so PPF would do you any good and even PF account for that matter.
You can only withdraw amount from PF account once you have resigned. I remember myself withdrawing PF amount 5 years ago and they took more than 6 months to credit the amount. Also, PPF has a locking period as well.
I'd say, furnish everything that can be easily liquidated such as savings accounts or fixed deposits etc. All the best.