Encoding of Bengali Khanda Ta in Unicode

Early in the 20th century, it was reported by Chatterji (1926) that ta-hasanta was preferred for indigenous Bengali words (i.e. those derived from Prakrit) in contexts in which conjunct forms would occur for loans from Sanskrit, Persian or other languages. Khanda ta originated, apparently, as an alternate way to write ta-hasanta in such contexts. (It is not clear to me at this time when this innovation occurred.)