Tl;dr: They do allow account closure from any branch.
I know this is off topic here. But since I’ve submitted closure form last week from another branch and the request was honoured so putting my experience. So maybe you can try visiting the nearest branch and ask them for the conversion (or maybe ask for account closure and new account opening in the nearby branch if they don’t allow conversion from non-home branch).
I’d salary account with HDFC, but due to company change and they HDFC don’t have my employer listed the account got converted to savings account.
I’ve visited the branch to ask if the account can again be converted to salary account (few months back maybe March, I’ve got a call from home branch, some random guy trying to sell some product saying he is RM though received calls from different persons called that time and said they were RM…. I’ve told this guy I want to close the account what is the process for that, he asked my employer and told me it’s listed so if my salary gets credited to the account it will again be converted to salary account…. Maybe he had not checked full employer name and just after seeing multiple organisations listed with similar name he told me about this). On visiting the nearby branch, the team handling salary accounts supported me in finding out the employer isn’t listed so I was left with option to continue or close.
I’ve decided to close 😀 and it was done from branch ~1200km far from my home branch 😅.