Hi Cameron, I think we can help you with your problem. We are running the Printout Designer app that allows you to create and design custom templates using our simple drag and drop interface, so no coding is required. You can bulk print, download, email and save your invoices directly to Dropbox.
Our interface also displays which orders are already printed, emailed or downloaded (and when). You can also filter out orders that are already printed.
You can try out the app for free for 14 days: https://apps.shopify.com/printout-designer
All the best,
Tanel from Printout Designer