Usually, when this is possible, it requires a dev to make a kit up to make ROMs flashable on another device. And therein lies the issue. Unfortunately, there isn't much development going on here in the note 8 forums at this time. If you want to run a custom stock ROM, I recommend the ROM in my signature as it is very stable or just run stock rooted and tweak it yourself. If you want an AOSP ROM, there are a couple available but they aren't very stable yet. Besides, I just don't see the point in AOSP on the note, as you loose a lot of note stylus features.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
Samsung Galaxy SIII SGH-I747
CyanogenMod v10.2 | Android v4.3.1
CWM Recovery v126.96.36.199
Samsung Galaxy Note 8 GT-5110
CivZ FlexBeam Rev3.6.1 | Android v4.2.2
CWM Recovery v188.8.131.52 Touch by CivZ