Because "View Only" doesn't (yet) exist and because of the "Add, Edit, Delete" combo on permissions roles like this are not easy to grant. You really don't want send them the "don't be dumb email" which equates to DON'T CLICK ON ANYTHING ESPECIALLY THE WORDS EDIT OR DELETE.
That said, I had to create a course role we named "DPT" (means department chair, head, provost, etc). It has highly restricted rights --I just counted, it has 8 course permissions. If I had to duplicate this for a sub-account I know it would need the "View the list of courses" permission.
The I would test it with a user to make sure it doesn't allow for anything I hadn't planned for.
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