I recommend creating these checklists inside of your database templates first (such as the YouTube video template). Create a Synced block there, include your checklist content, and then copy and sync the checklist here.

By doing it this way, new content projects will get a unique copy of the checklist that can be edited without changing the main one in the template, which is also synced here.

See my guide on Synced Blocks in Templates to understand this better!