If you could get early ToT, you would go through the dungeon backwards, skipping the entire Lanaryu Desert Section. But again, this is all theoretical. First find a way into ToT, then we can talk about how it is sequence breaks. It is clear it would be worth it, but it's probably impossible with current known glitches.
We discussed this about 2 months ago.
It is not possible to skip all of lanayru desert, however, back then we had a lot of theories.
This was my route theory if we could get ToT early:
First get ToT early while being OoB to reach the OoB owl statue in ToT.
Wrong warp with that statue (not BiTWW just regular wrong warp)
This took you to the stone cache or w/e the building is called.
Continue all the way to the gust bellow.
Exit LMF and use the owl statue to get to ToT.
Enter and exit the back entrance to get the harp.
This didn't work since we couldn't find a way to access ToT in its OoB state.
My second theory was to just access the north section of the desert, enter LMF, get the gust bellows, exit.
Then take the north-west path to ToT and somehow get over the broken wall.
Then just enter and exit the back entrance to get the harp.
I have been very close to get up onto the broken wall at ToT, like a few pixels away, but it just wasn't enough.
If we could perform a highjump anywhere, I'm pretty sure we could get over.
The thing is that this only would save a few minutes now that we have the BiTWW in LMF. It is still a decent timesaver though.