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TheEdlets - If you are proficient with a word processor and have access to it and you can wrangle the blogposts into it, then that may be a better place to start (given you've tried Scrivener it should be possible).
Scrivener is a primarily a writer's tool, your task would appear to be that of book builder.
There are browser extensions that will help create ebooks from webpages - this describes one of them ==>>
Build your own multi-article EPUB with GrabMyBooks
I suggest this thread be moved to the Workshop forum.
BR