That could work .. definitely adds some complexity to the process of creating new show posts though. If you have a projected time in mind that doesn’t require adding an update to the functions.php for each show post let me know. I can use this solution for some of the critical pages though. For right now, it’s easier to force a column size and let the image resize with css.
E.g. https://www.sandandsteelfitness.com/newsletter-subscribe-successful/
Although that does waste bandwidth and hurts page speed.
-Paul