Hi Arpit,
Thanks for your time and feedback.
1. Updated, thanks for reminding...

Hi Arpit,

Thanks for your time and feedback.

1. Updated, thanks for reminding on that.
2. _addressfield_country_options_list - this is defined in the dependent module addressfield
3. Majority of this code is copied from addressfield and only required changes are done.

Let me know your thoughts on this and further feedback whenever you get chance.

Thanks,
Nikunj