As you can see from the – modest – layout, the migration to the Python Desktop Server was successful. It's still a bit bumpy, I'll need to go through all the posts to iron out bugs and errors and fix formatting, and I'll also need to work out bugs from the software itself, but overall it worked out.
The only real downside: all the old comments are gone. Well, not gone, but they're no longer referenced here. Well, it's not much of a loss with around 12 comments.
Otherwise, I'll now probably get back to optimizing the tool, because with several hundred posts it apparently gets a bit slower again. Anyway, I have the source. And it's mine.