Hi,
Your project sounds interesting and I would love to work on it. However, I can't really suggest the plan of realization of the project, because I would first have to see these websites and their configuration. It is quite certain that I could do what you are asking even if I had to simulate human work on the admin page of the website. I would build a program in C# and it would be a desktop app, if it's all the same to you.
As for my experience, I worked for over 15 years as Physics and Math teacher, but I've also done a lot of both Excel and MS Word work (Macros, Templates, complex formulas), some web scraping using my software, desktop applications, web browser extensions, etc. In my portfolio you can find some screenshots of application that I made for my school-related needs.
Should you have any questions about me, my work or my experience, I'll be happy to answer. In the meantime, see my reviews and kindly consider my proposal.
Kindest regards.
Milan