Divorcing and 2nd Marriage

Hello to everyone!

I am a UK citizen, got married in Pak many years ago. My wife is a UK citizen too now. Unfortunately, we have to go through divorce, but divorcing in the UK is a lengthy process via legal-aid. We never had any marriage registration in the UK, we do have kids.

My questions are:

1- May I file a divorce in Pak as both of us are also Pak citizens too?.

If I do so, I may get the court verdict (Talaq Papers) in shorter time and can obtain authentic translation, stamped by a solicitor 'as original', verified by Pakistan foreign office and m/o Religious affairs in Pak.

Then, secondly, I may also get the receipt/acknowledgement of the above document from my present wife (that time, would be ex-wife).

2- Would these 2 documents be recognized in the UK, and enough prove to apply for immigration for a 2nd wife?

As our Nikah nama (Marriage Deed) and its authentic translation stamped by the a solicitor 'as original', verified by Pakistan foreign office and m/o Religious affairs - was recognized earlier in case of my present wife's immigration.

Any one kindly advise me.
Regards