Well, you surely could do this via some proxy setup. But in that case you could also simply rely on LetsEncrypt directly; them going away is as likely as your a

Well, you surely could do this via some proxy setup. But in that case you could also simply rely on LetsEncrypt directly; them going away is as likely as your average hosting provider. Now, of course that's an item on the maintenance list if you're hosting the web page yourself, but as mentioned above: You still need regular updates, having certificate renewal on that list doesn't make any noticeable difference.