Bigamy In Non-Muslim Society
None of the countries that I am aware of recognize mere Nikah done privately or even publicly. Such countries, even including Pakistan, have some legal formalities that are required to be fulfilled for validation/registration of that Nikah. And it is our responsibility as a Muslim to abide by all those terms as well. Unless you mean something else by the statement “ The law of this country does not recognize Nikah as a legal contract “, this argument is not valid. In such scenarios, both the requirements should be fulfilled by a Muslim, that of an Islamic Nikah and that of a country where one is residing related to marriage registration. Faking a divorce not only undermines the institution of marriage at your end by showing a live-in relationship publicly, but it is essentially a deception which is against Islamic principles, both the fake divorce and live-in relationship. The videos of Ghamidi Sahab in my opinion principally apply to your situation as well.