Realistically: reduce your own cert renewal window to weekly, if not daily. This forces you to have a good renewal system in place and alerts you to failures long before actual expiration.

Quixotically: make cert failure a randomised number, linearly related to how long ago the cert expired. This slowly introduces more and more failures, over a certain “grace period”, which makes the problem less of an extinction level event. It’s not a solution but it definitely would help.