So I've got good news and stressful good news.
The regular good news is that I ran the quickstart for my friends and they loved it! They weren't impressed with the dueling rules but they were glad to hear they wouldn't be kept in the final version.
The somewhat stressful good news is that they loved it so much that they want to keep on playing. Luckily they want to keep on going with the premade characters so I theoretically can just keep going with the quickstart rules and supplement it with info from the 1st edition PDFs when they're released, but right now I just need to come up with something.
They ended the game by beating the swordsmaster (partially due to a misunderstanding of the dueling rules, but I'm not about to retcon the fight because of it.) But given that I don't know anything about the Sarmatian Commonwealth beyond what was told in the quickstart, I'm not ready for them to return there and retake the Prince's throne. It sounds like the Prince's player probably won't be able to keep playing though, so I thought it might be a good idea to delay their return by kidnapping the prince.
Anyone have any ideas of where I could go from there? They're currently in Vodacce, but I wouldn't be adverse to them having to go to somewhere close by like Castille or Eisen.