I totally missed this. Thanks for the idea. The process does look like it will take some effort (checked HDFC).BTW folks, why don't you put your gold coins(if you are not able to get better value on selling) in RBI's Gold Monetization Scheme?
No locker charges and you get 2.5% interest on gold and being RBI it's safest bet.
I will definitely try it out if I accumulate a lot as it removes the risk of physical gold.