So if I'm understanding this correctly, you want to use a script/program that lets you enter a website template and a link and it'll post the link on the blog as a comment?

I don't see why you'd need the template. You'd have to use a template and you could use regular expressions (or recursively PHP explode() several times, splitting the website) to read, however to post a comment you'd just need the names of the form fields and you could just send a POST form submission from anywhere.

I'm not entirely understanding what it is you exactly want, though.