So to my knowledge you cannot modify the types of content that hubspot pulls when getting the blogs. At least not using the standard blog template markup. That means pagination isn't the issue. You'll need to rethink how you're getting or even storing the blog posts.
An option might be to export the blog, separate the posts in a spreadsheet, then upload to two different blogs. Or even unpublishing all non-featured posts.
What I am trying to do is a little hacky, admittedly. I want to have posts that are published and viewable, but I don't want them to be shown on the listing page. So separate blogs or unpublishing them is not an option.