The idea of a Banga release group is superb BUT don't be the cause of a laughing stock by using the abbreviations BRG as that would just not be right. Yes it can mean the initials to Bangla Release Group but then again Bollywood Release group had this first so it would be copying them. Best thing is be unique in your release group such as BPRG

Bangla
Probashi
Release
Group

Just a suggestion guys!