Hi @jconway ...
I think you would need to have access to the XML code that is used during the Zoom LTI setup and modify one of the lines which hides or displays the "Zoom" course navigation button. I think one of the lines you'd be looking for would be something similar to what @garth displays in his posting here: Re: How to configure XML for LTI to open in new ta... - Canvas Community. You'd just have to change one (maybe two) lines of code to make the Zoom button enabled instead of disabled. Then, it should be visible for all courses as your "default".
I hope this will help a bit. Sing out if you have any other questions about this...thanks! Take care, stay safe, and be well.
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