Add PMPro billing fields to the edit user profile page. You must Paid Memberships Pro and the Register Helper plugin installed. Then add this to a custom plugin or your active theme's functions.php

pmpro_add_billing_fields_to_profile.php

/*
  Add PMPro billing fields to the edit user profile page.
  You must Paid Memberships Pro and the Register Helper plugin installed:
  http://wordpress.org/extend/plugins/paid-memberships-pro
  https://github.com/strangerstudios/pmpro-register-helper
*/
function add_billing_fields_to_profile()
{
	global $pmpro_countries;
	
	//check for register helper
	if(!function_exists("pmprorh_add_registration_field"))
		return;
	
	//define the fields
	$fields = array();
	$fields[] = new PMProRH_Field("pmpro_baddress1", "text", array("label"=>"Billing Address 1", "size"=>40, "profile"=>true, "required"=>false));
	$fields[] = new PMProRH_Field("pmpro_baddress2", "text", array("label"=>"Billing Address 2", "size"=>40, "profile"=>true, "required"=>false));
	$fields[] = new PMProRH_Field("pmpro_bcity", "text", array("label"=>"Billing City", "size"=>40, "profile"=>true, "required"=>false));
	$fields[] = new PMProRH_Field("pmpro_bstate", "text", array("label"=>"Billing State", "size"=>10, "profile"=>true, "required"=>false));
	$fields[] = new PMProRH_Field("pmpro_bzipcode", "text", array("label"=>"Billing Postal Code", "size"=>10, "profile"=>true, "required"=>false));
	$fields[] = new PMProRH_Field("pmpro_bcountry", "select", array("label"=>"Billing Country", "profile"=>true, "required"=>false, "options"=>array_merge(array(""=>"- choose one -"), $pmpro_countries)));
	$fields[] = new PMProRH_Field("pmpro_bphone", "text", array("label"=>"Billing Phone", "size"=>40, "profile"=>true, "required"=>false));	
	
	//add the fields into a new checkout_boxes are of the checkout page
	foreach($fields as $field)
		pmprorh_add_registration_field("profile", $field);
}
add_action("init", "add_billing_fields_to_profile");

$fields[] = new PMProRH_Field("pmpro_bcountry", "select", array("label"=>"Billing Country", "profile"=>true, "required"=>false, "options"=>array_merge(array(""=>"- choose one -"), $pmpro_countries)));

This line (select drop down) is showing in the WP profile, but the data is not populating, and the are no options to select.

Because you have to declare the variable as global first:
global $pmpro_countries;

Then it will work .. ;)

for the billing country field it returns alpha-two codes. Not the full country name!
besides, the revised version did not work. I removed pmpeo_ and it worked.