Currently, adding in ContentVersion records which hold Files. I want them accessible by Community users but the associated ContentDocumentLink is defaulted to view for InternalUsers. Is there a way to change it so that it defaults to ALLUsers, instead of changing it in a trigger?
No, there is no default you have control over. It actually defaults to "internal users" only because you have communities enabled. You'll have to use a trigger or tell your users to explicitly share it with all users.
Lightning UI version of customer access to files https://releasenotes.docs.salesforce.com/en-us/winter20/release-notes/rn_files_visible_on_records.htm