Populating data from more than one field in another form

Hi I need some help with this please ?

I have two forms:

Form 1: This is used to gather client information such as first name, last name and ID number, all in different fields.

Form 2: This is used to create projects which are assigned to various clients as created in Form 1. I want to have a drop down with the list of clients from form 1 displaying First Name, Last Name and ID Number. I have tried to do this using Dynamic Dropdown but it only allows me to select one field.

How do I modify the following code so that the drop down includes a 3rd source of data from the form to include in the drop down (with ID 173):

add_filter('frm_setup_new_fields_vars', 'customize_dfe', 25, 2);
function customize_dfe( $values, $field ) {
if ( $field->id == 182 && !empty( $values['options'] ) ){//Replace 125 with the ID of your dynamic field
$temp_values = $values;
$temp_values['form_select'] = 170; //change 30 to the id of the second field you want to show in your dynamic field
$field2_opts = FrmProDynamicFieldsController::get_independent_options( $temp_values, $field );
foreach ( $values['options'] as $id => $v ) {
$values['options'][ $id ] .= ' '. $field2_opts[ $id ];
}
}
return $values;
}

Thank you very much!