Permalink chaos

My blog, soul-sides.com, was once on Blogspot but I switched to WordPress and imported my old posts over
.
The problem is that I didn’t realize – until much later – that the permalink structure was different. Hence, maybe 60% of my posts were under the old Blogspot convention of ending with .html while the new WP ones do not.

Here’s an example of an “original” BS post: http://soul-sides.com/2010/02/covers-power-pack.html

Notice the broken image links; this is from an older template that I haven’t used in years.

I can still access this post, edit it and update it, but it updates to my new permalink convention which is identical to the other one except there’s not .html

Here’s the same post but as WP generates it: http://soul-sides.com/2010/02/covers-power-pack/

In essence, I’m creating a parallel set of posts, with different permalink names but Google will still find the posts ending in .html before it sends readers to the newer, WP-formatted ones.

I tried doing a batch redirect via the .htaccess file but that’s only half successful since the only way it works is if the original BS and new WP files had the same exact permalink names with the only exception of the .html. But BS had a character/word limit so it would truncate some file names whereas WP does not.

I think I only have one of two solutions, both of which would be brute force methods:

1) Leave everything as it is but go into every single one of the old BS-named posts via FTP and insert a custom redirect command to their WP-named twins.

OR

2) Put a redirect command into the .htaccess file that would take care of some of the old BS-posts automatically but then I’d have to identify – one by one – which posts still don’t work and change their permalink by hand in WP to properly match.

***Anyone far smarter than me have another solution that might work?***