It's not particularly easy to place b2evo inside another, static html page. It also makes hell for your visitors if they want to make links to your pages.

What you're trying to do, if I've understood you correctly, is to have a normal blog and three other pages which go alongside it but are not actually changed via the blog.

The three unchanging pages could just be simple html. You could use b2evo to manage your list of links but if you're not going to have anyone else doing it then you may as well do them in html. That just leaves your blog, which can be a perfectly normal b2evo blog.

To make your blog integrate with your site, you could change links to blog.html to something like /blog/, and put b2evo in there. Then make your b2evolution skin look as much like your other pages as you can. Actually it's usually necessary to do a bit of both - you might have to change the base pages to look like the blog a bit as well, until they all look alike.

Here's an example:
[url=http://mattandcat.co.uk/]This is not a blog page[/url]
[url=http://mattandcat.co.uk/reviews/]This is a blog page[/url]
They look similar, don't they? But the first one is just an ordinary html page made to look like the blog. The second one is entirely generated by b2evo.

You basically have to skin your existing page into b2e. Thats what I ended up doing and it worked pritty well.

Only think you have to wory about is if you have any custom PHP so that it does not clash with b2evo.

IE: a $title variable.

Example as above

[url=http://www.ibenefitrx.com]Pharamcy [/url] Retail Site
[url=http://www.ibenefitrx.com/blog]Pharamcy Blog [/url] Site

the blog is a custom skin that was a merge of custom skin and our site template.

Couldn't you just use an iframe?

Like this

<iframe src ="www.mydomain.com/index.php?blog=1" width="100%" height="300"></iframe>