I thought I'd give a little update. The consensus on this thread was that I'd have AS access, but I saw on other posts that people in similar situations were advised that they wouldn't.

I decided to go straight to AS and give it a try. No questions asked and I'm currently here now. 🙂 I'm not 100% sure if it was my arriving F flight or Plat+J departure (even with a P/Lite fare) that gave me access. I didn't want to ask questions. Lol. I'm just glad to know for next time.