Logo/menu left sidebar – add a custom widget area to top right using functions

Hi,
We are redesigning a website using the Enfold theme while trying to keep the original look and feel of the old site. The logo and menu are vertical in the left sidebar, but there are social media icons and phone number that need to display in the top right on all pages/posts. So far, we have recreated this set up using a custom widget on the home page and child theme copies of page.php and post.php for the other pages. There are too many pages/posts to add the widget to all. It is not ideal to have it set up this way as we don’t want it to be an issue with newer theme versions down the road. Can you recommend a way to add the custom widget using functions.php instead? The website details are posted in private content. Thank you.