As a test, I exported three products, edited the Excel file (just added my name to the Name and SeName), and the imported. I saw a 404 on "/Admin/Product/ImportExcel". I clicked the back button and saw that I now have three new products with missing pictures and data. I don't think I can hand that process off to Marketing. Fortunately, this was in dev :)
I might go with the SQL script after all.