Rebasing Page for new Updates

Is there a workaround for if a release update completely breaks page designer on specific pages? Most pages I can go in and rebase no problem, but some will not load at all, returning an error. The error only lets you reload the page or go home. The only way I’ve found to deal with this is to delete all customizations and add them back manually. This gets very very time consuming for pages with a lot of customizations. Hoping there is something that can be done to get around this.