I had read a report that Hindutva radicals have implanted some 650,000 of their agents in Bangladesh in various sectors of society to try to subvert Bangladeshi progress, to try to turn Bangladesh into a part of their radical backward vision of the 4th century BC dream of "Akhand Bharat"). That number of 650,000 may be exaggerated (or it may not be), but it is certain that their agents have been planted on Bangladeshi soil.
Allow me to express my disagreements to some of your points.
The matter is beyond the issue of BNP or BAL only. Why do respected 'scholars', 'analysts' or 'experts' cite the den of Hindutva terror, Britain or America, as examples or as countries to be compared with on every issue in their analysis? Governments may change from time to time, but these 'forces' remain constant. Whole education system, political system, intellectual class, scholars etc etc need major revamp.