So I did end up just creating the vCard upon saving the custom post type by cobbling together a few different methods. I started with this function:
function hj_create_vCard( $post_id ) {
/*
* In production code, $slug should be set only once in the plugin,
* preferably as a class property, rather than in each function that needs it.
*/
$post_type = get_post_type($post_id);
// only update the attorneys custom post type on save
if ( "attorneys" != $post_type ) return;
$vpost = get_post($post->ID);
$filename = $vpost->post_name.".vcf";
header('Content-type: text/x-vcard; charset=utf-8');
header("Content-Disposition: attachment; filename=".$filename);
$data=null;
$data.="BEGIN:VCARD\n";
$data.="VERSION:3.0\n";
$data.="FN:".$vpost->post_title."\n"; // get post title
$data.="ORG:Client Company Name\n";
$data.="EMAIL;TYPE=work:" .get_field('att_email',$vpost->ID)."\n"; // get acf field value
$data.="TEL;WORK;VOICE:" .get_field('att_phone',$vpost->ID)."\n"; // get acf field value
$data.="ADR;WORK;PREF:123 Fake Street;Fake City;MN;55106\n"; // get acf field value
$data.="END:VCARD";
$filePath = get_template_directory()."/vcard/".$filename; // you can specify path here where you want to store file.
$file = fopen($filePath,"w");
fwrite($file,$data);
fclose($file);
}
add_action( 'save_post', 'hj_create_vCard' );
Then for use in my template I just grab the file that is generated on save by looking for the file based on its name, which is generated from the page slug:
<?php
global $post;
$vcfname = $post->post_name;
?>
<a href="<?php echo get_template_directory_uri(); ?>/vcard/<?php echo $vcfname; ?>.vcf"><i class="far fa-address-card"></i> Download Vcard</a>
