I think we need to look over the flags for the barrier again.
Entering Hyrule 2 normally, then enabling full Triforce (with cheats) allows me to fight the Dark Nuts and beat the game.
https://www.youtube.com/watch?v=gYZH1GddImU&feature=youtu.beFull MS and full Triforce are NOT requirements to break the barrier. The only flag (I believe) is that the cutscene of Link running up to Hyrule exterior after the Dark Nut fight is triggered.
The flags for that cs (I believe) are:
Electric barriers enabled in hyrule 1
Full Triforce.
Dark Nuts dead.
Link statue open.
Therefore, full Triforce is always required. But in my video I show that even when disabled with cheats the cutscene still plays.
What makes this potentially significant is that the full Master Sword is not required.
The problem is having the statue open.
This needs to be looked at more in depth. If there is a way to enter Hyrule interior with the statue open and full Triforce then I believe barrier break early is possible.
Also strangely, I can leave Hyrule and reenter if I obtain the full Master Sword. Then for some reason when I reenter Hyrule the barrier has already been broken.