Why though? If they see BTC as goods then it's the same as buying a piano; if it's currency then it's the same as buying euros. Is either of those things illegal in India?
Also I assume this would be a small amount, not something that would have a tax impact regardless of whether it's a good or currency.
I admit I don’t understand the full technicalities but it’s better to err on the side of caution and stay away from it.
Hence, direct bank online transfer.