There is no Bengali alias as of now. "wikimedia-BD" caters to Wikimedia activities in Bangladesh ( and Bengali as of now). We have started outreach programmes in West Bengal( state of India, which pre-dominately speaks Bengali language) http://en.wikipedia.org/wiki/Wikipedia:Meetup/Kolkata/Kolkata1
We need a new alias to co-ordinate Wikimedia/Wikipedia activities in West Bengal & Bengali wikipedia in India
Kindly create a new wikimedia alias "wikimedia-in-wb"