I'm not familiar with SMF Database.....
However.......
Most databases can import formatted data from other sources.
i.e Formatted Text files (or even HTML in a simple table format)
Since SMF works with standard SQL (MySQL, PostgreSQL, or SQLite), that shouldn't be an issue.
Looking at the Archives I sent you, the HTML coding in the threads isn't complicated. It's 'overformatted', but that's pretty much par per course for Web discussion forums. (They pretty much need to be).
Stripping out the unneeded HTML Coding, and reformatting everything shouldn't be difficult.
As for the importing, it would really depend on what can talk to SMF databases.
If I get the time in the near future, I'll see if I can get MS-Access to use SMF as a back end. If it can, then setting something up to import it all into SMF for you to play with shouldn't be that hard.