I called the CS to inquire about feasibility, but they had no idea what was happening. Instead they asked me to contact Airtel by sending an email to 121, but even after four days and two bumps, I haven't received a reply yet.
Looking at
@Vandhana's results, the 8 Mbps upload gives me great hope, I was afraid Airtel would still insist upon 512kbps or 1Mbps as UL speed.