Drop everything and check out Building PowerPoint Templates, V2
This all-new edition is literally just weeks old. And you cannot find two better authorities on the topic, either. Your boos needs this, you need this, and everyone on this thread needs this.
https://www.amazon.com/Building-PowerPoint-Templates-Echo-Swinford/dp/B09GJSBCQH
The others are correct; there's almost certainly no way of automating this, but WHATEVER you do, do nothing until you've got a good solid template to start with. Otherwise you'll just have similar problems, though perhaps not quite as severe, when the next rebrand comes along down the road.
There are people who do this professionally; two of the best have written the bible for creating good templates:
https://www.amazon.com/Building-PowerPoint-Templates-Echo-Swinford/dp/B09GJSBCQH/ref=sr_1_1?crid=5T7NFC448JSB&keywords=building+powerpoint+templates&qid=1671661013&sprefix=powerpoint+templa%2Caps%2C97&sr=8-1
You'll want to get a copy. Then maybe hire the authors. ;-)
Taylor's a good guy and a funny, mile-a-minute talker. The man can pack more useful info into a couple minutes than anyone I've ever heard.
If you want THE reference on building templates, though, check out Building PowerPoint Templates (Swinford & Terberg). https://www.amazon.com/Building-PowerPoint-Templates-Echo-Swinford/dp/B09GJSBCQH/ref=sr_1_1?crid=1QGHBF52Z7C7G&dchild=1&keywords=terberg+swinford&qid=1635382880&s=books&sprefix=terberg+swinford%2Cstripbooks%2C71&sr=1-1
Disclaimer: they're both friends of mine.