not only used for the Bengali language. The Bishnupria Manipuri language is as far as we know written exclusively in this script.
The best way to explain what the Localisation team can do for a language community is to implement known solutions. Adding the support for the Lohit Bengali font for Bishnupria Manipuri is easy and obvious.
We do not know if there is a need for an input method that is specific for Bishnupria Manipuri. For that we need to be advised by people who know the language. When they work together in a language support team, we can build the framework that they can implement solutions for their language on.