I do not need to visit bangladesh, I have seen enough of them, they all look similar, ie flat nosed, very dark and with clear east asian influence although their are some exceptions ie those that look like tamils or other southern indians.
I have heard from immigration officers that your govenrnment refuses to acknowledge them, kind of how they refuse to acknowledge their rohinga brothers, these illegal cretins who cross our borders always throw away their documents and I have heard even when the identity of these folks is ascertained the bangla government refuses to take them, Hasina hates Pak ,so why dont she take back her precious citizens.
In regard to your final point, the people of sindh are absolutely sick of these folks, why should the cash strapped sindh government cater to these illegals they are a bloody major burden to them ,surely its the job of ugly gremlin hasina to cater to the sons of bangladesh.
We will do a swap, deport all these bengalis to bangla and we will relieve the bengalis of biharis. sounds fair!