The best way to deal with Burkha wearing people is to ignore them.
If they chooose to hide thier identity then they are (de-facto) invisible and should be treated so.
Refusing to speak, listen or acknowledge them within banks businesses etc. will make the employers enforce a Face-to Face policy.

I beleive the wearing of religious apparell is inapropriate in almost all circumstances.

Religious beliefs, if you have any, belong inside your head and is strictly between you and your chosen immaginary friend.