Humm.... The stiuation looks grim...
First of all the speed on Reliance Data Card Sucks.. mostly it connects to 1X network with 50KBPS speed max.
Also I burned the Wi-Fi Router's power adopter by plugging it directly to 220V (It was bought in US so 110V, I used it with the converter earlier, but some how missed it). So I can not even check the technical feasability.
Interms of Bridging it, XP does not allow a Wireless connection to be bridged - so I need to look at the Proxy server route.
I will start digging once I get the adopter fixed - will keep you posted.
Also, banging to Doors of BSNL for BB connection!