Hello there, @brystfire08 ...
I am not aware of any External Tool (LTI app) that would remove the "Next" button from your course. API is not something I am not well versed in, so I won't be able to address that specifically. There may be something that your school's Canvas administrator could do either in the global CSS or global JavaScript file. But, keep in mind that if your Canvas admin would make a change like this...it would apply to all courses at your school...not just your course. So, you'd want to have a conversation with your Canvas admin to discuss what other options you might be able to come up with.
I hope this will be of some help to you. Sing out if you have any other questions...thanks! Take care, stay safe, and be well.
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