A while back, I did a bit of research into how the fog glitch works, because why not. I plan to make a more comprehensive write-up on it some day, but there are still some unanswered questions I still haven't poked into. So for now, I'd like to cover a new way to trigger the glitch.
To start, you will simply need to perform RC Epona glitch as an Adult, so that you can warp directly into a loading zone trigger. I believe the loading zone to Lon Lon Ranch will not work for this because it overwrites the variable we need to keep set. Personally, I decided to use the loading zone to Lake Hylia because I figured it would be easier to wedge Epona in place, trapping her in a small section of the map. One important thing to note is that if you attempt to climb the ladder over there while Epona is touching the loading zone, you'll trigger the zone out. So you'll need to position Link so that he can maneuver around the fencing in the area, and manipulate Epona's position so that she gets wedged into a spot where she won't move much.
Next, make your way over to the entrance to Market Town, which is always covered by a thick fog whenever you approach it. As soon as you start to see fog setting in, press A to mount Epona, and hopefully she will be standing on top of the loading trigger, taking you out of Hyrule Field.
An important thing to note is that the side-effects from this fog glitch should actually be somewhat different from what you'd usually encounter when triggering it in Kakariko, due to the game using different offsets for the environment lighting settings.