Dear Mr Walia,
Thank you your query. As I understand you seek an Expert opinion on what challenges and difficulties you and your family could potentially or most likely are going to face whilst applying for for a long term visa to stay in India and it seems the report most likely could also be put before before the Immigration Tribunal in the UK as to why you and your family should be granted to stay in the UK.
By way of introduction, I an Indian Advocate who has extensively worked on issues of immigration and preparation of Expert report (Deportation, Asylum etc.). In the past few years I have, working closely with an English barrister, have been successful in assisting clients who had sought similar assistance.
Coming to your query, it is indeed true that migrating back to India with your spouse who has her origin in Pakistan would be difficult in convincing the authorities as to why you and your family be allowed to migrate back without any checks. Further, in the event your wife is granted a long term stay visa, she would still be at a great risk of constant police harassment and you both along with your child may not be able to lead normal lives and enjoy it to the fullest as any other family in the usual circumstances in India.
If you could please tell me if you have instructed any solicitor in this matter who in turn could instruct us to prepare a report and we could proceed with things. Also a timeline could really help.
I hope this assists.