Does anyone know if it's possible to alter a bundle-installed custom record change one of the fields from disabled to normal?

Hi Will, yes there's a few ways but, it depends, and ask yourself should you 🙂. Some bundles allow you to edit the custom fields they've created, other times not and usually for good reason. if the field is locked, its best to understand the functionality, and how they disabled it, as it could be disabled on the custom field it self, or disabled in their script. Understand how its used/functions, before you unlock it with a script or a custom field change, as you may break the functionality of it and cause a challenge.