After trying several other approaches, I've decided to go with using the fa-street-view icon from Font Awesome*, linking it to the URL above and styling that.
.site-footer .footer-container .footer-content .footer-links a .footer-icon i.fa.fa-street-view:before {
content: "TOB" !important;
font-size: 1.3rem;
}
*I could swap this out for the fa-child icon as a backup, if desired
.site-footer .footer-container .footer-content .footer-links a .footer-icon i.fa.fa-street-view:before {
*I could swap this out for the fa-child icon as a backup, if desired