On the note of lectures for subjects like English with 300+ students, I personally don't think it'll work out well (well it could for MHS but for other schools the lectures wouldn't work out so well imo).
It works for universities - ever sat in on one of the geoscience lectures at Monash, before? I know some JMSS kids do.
Personally, I reckon having some lecture-formatted classes for students could work very well if implemented properly. Maybe if they started it at say, year 10, so that they don't get the scare right on year 12. During year 12, I went to quite a few lecture-type talks, and while I don't feel like I learned much at first, the more I went to the easier it got. By the time I was in uni, the lecture-format wasn't an issue at all.
Changing starting times is a bad idea - no matter where kids go after high school, they won't have the luxury of choosing the times they go into work/uni/TAFE/whatever. (welp, unless maybe they do common degree #32 with super flexible times, but that's unlikely to even exist, methinks...) Let them learn at school that they need to have a balance, when the worst that could happen is they get a not-nice mark on their report.