Every phone bought outside india is considered as bad esn on reliance and other operators until its registered on the network. So it doesnt really matters whether the handset is having good or bad esn (but beware while buying, sometimes bad esn means zeroed out figure)
BBM BES BIS are supported over wifi in bb os7 which 8330(it doesnt have wifi too) doesnt suppport, facebook, twitter works over wifi however.
Some phones do have, m not too much fond of those phones, htc droid incredible 2 (fully supports any gsm and cdma sim card till now) and photon 4g(this works on old cdma sim cards, particularly old tata and reliance) are some devices which i have used personally on cdma networks.
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I'm not into field ? I have been using foreign cdma handsets from past many years, since the motorola razr, and i'm not flowing any false information here, hardly any1 is willing to buy gen old 8330(even both comes in ESN and MEID variants) and 8130, both can be made worked by flashing the reliance VSM files by nuking the handset.
I can create a new thread, but again m not here for business as same as you, we both are doing it for the help of community, so i think its useless to create a new thread! Still if you can provide me permissions to copy your OP (which is greatly written), i can make a new thread if you want anyways!