Have you tried PowerBI Robots yet? It allows you to set a schedule (from minutes to a year) to automatically export Power BI reports as PDF files (and images as well) and send them as an email attachment, to a SharePoint library, File system or a generated URL so you can display it on any device. It's very similar to the solution you linked to but doesn't have the requirements you mentioned.
If you have any questions about it, feel free to ask. We're from the team who developed it.
Images and PDFs on PowerBI Robots are always generated locally, i.e., on the computer running the agent. The program doesn't currently support DirectQuery (you need to have your reports on Power BI Online), but our team is working on adding it in the next update. If you're not subscribed to the product's newsletter, we can contact you here once it's implemented.