Bengali Locale Specific Data (RFC 3066)

Dear Martin,

Can we add locale specific data as  "bn-selet" for a dialect of Bengali called "Selet" ?
Can we use   "bn-selet-BD" for Bengali dialect called "Selet" in Bangladesh and
"bn-selet-IN-AS" for Bengali dialect called "Selet" in the state of Assam, India?
Thank you for your kind comments.

Regards,
Goutam Kumar Saha