Thanks to a pointer from Sameer D'Costa, I just used a handy shell script to export all of my Safari RSS subscriptions to an OPML file that can be imported into Wordpress to update my links/blogroll. Easy peasy.
I hadn't realized how much my subscription list had grown... It's now up to 469 feeds, and I didn't even realize it - that's 100 new feeds since switching to Safari RSS.
Update: Almost forgot - had to modify the .opml export slightly. Out of the box, the script exports urls as "xmlUrl", but Wordpress expects "htmlUrl" - easy to change using a batch find/replace, and easy to fix the script, too.