A Voters ID card along with Personal Identification Number (PIN) similar to your bank card can be allocated to all the citizens. The Voter can use this pin to vote from ATMs, Super Markets, Phone (like mobile Banking), internet, printed forms,etc.
A Voters ID if provided along with unique and confidential PIN can be assigned to all the citizens similar to credit cards. This card will allow the voter to vote through ATMs, mobiles, internet (online Voting), super Markets through transaction machines.
For remote users, illiterate and non IT people, a printed pictorial form with postage and pre-addressed envelope can be provided at post offices, bus stops, super markets, local stores, library, etc. The impression of this card along with PIN number can be filled in and dropped in any local post box. See pic 3 for clarity.
Also each PIN/CARD can be used only once, for voting.