[@dragunoff Member 15 years, 7 months ago]

I guess the most simple (and painless) way to do this will be to redirect/rewrite the profile URL from bbPress to point to the profile URL in WordPress.

You can reference the profile by the ID – in bbPress it goes like http://example.com/bbpress/profile.php?id=1 and it is equivalent to http://example.com/wordpress/?author=1

You just need some .htaccess magic