Easy does it, step by step, one step at a time. No rush. Remember Historical Continuity is one of my core theories. We will reintroduce Nastaliq script and reintroduce Persian, Arabic and Turkic loan words, but the skeleton of the language will remain the original Bangla derived from Prakrit, even if we cut out and drop the Kolkata imposed Sanskrit words, just like Urdu retains Khariboli at its foundation.
Changing scripts and loan words will make it sufficiently different, just like there is difference between Hindi and Urdu.
I have another interesting suggestion for you guys in West Bengal and Assam, you should also drop the Brahmi derived Bangla/Assamese script and replace it with Devnagari, which is very similar to it anyways. That way Hindi and Indian Bangla will be both written with Devnagari script and it will help further integration between West Bengal and Assam with North India, where Devnagari is in use.
Once we have different scripts and loan words, that will create sufficient barriers between two cultures, as written material, news and web media, literature, text books everything will become different and mutually unintelligible to each other. Only spoken words may be similar like Hindi and Urdu, but that is ok.
To maintain Historical Continuity we must retain our original base language, regardless of the fact that it will be same as or similar to West Bengal. Please note that for most of 1204 to 1757, the court language in Bangalah as well as Delhi was Persian, using Nastaliq script. So while we will retain the spoken base language, we will also retain what we had for 500 years, Nastaliq script and Arabic-Persian-Turkic loan words, for the sake of enhancing Historical Continuity. For us it will be uprooting and throwing away the colonial imposition of British rule and resulting influence from Kolkata Bengal Renaissance and thus going back to our root, the original period of ethno-genesis of Muslim Bengali people during 1204-1757.
The origin of the name Bengal and Bangalah:
Bangalah | BanglaPedia : National Pedia of Bangladesh
Nastaliq Persian inscription in mosque built in 1692:
Banglapedia
"Walipur Alamgiri Mosque situated in Walipur village under Hajiganj upazila of Chandpur district. There are two mosques in the same locality - one known as Shahi or Alamgiri Mosque and the other as
shah shuja mosque. The Alamgiri mosque has suffered much due to subsequent restoration works. Nevertheless, enough still survives to give an idea of its original plan and design. A Persian inscription in fine
nastaliq character, fixed over the central doorway, records the construction of the mosque by one Abdullah in 1692 AD in the reign of Alamgir
aurangzeb."