Does the unplug trick let the Tingle Tuner work anywhere else? For example, in Hyrule Castle, or in the exterior part of Ganon's tower (where trial skip is done)?
Also, I made a version of Lua that works on more modern builds of Dolphin, if that would help? (it's from about a year ago).
The Tingle Tuner exploit only works in all the Ganon's Tower stages (minus the Ganondorf stage being boss type), which includes where trials skip is done yes. It does not work anywhere else in the game with one exception being ADMumi (the stage with the bell after beating Tower of the Gods). So it does not work in Hyrule Castle, in caves or in houses for example.
If you have a link to your build with lua scripting I would be interested to take a look. TASing this game pretty much cannot be done decently well without scripts now really, as important things like superswimming and salvaging need scripts to be optimized. Last I tried newer dolphin builds were still more desync prone than the old dolphin 4 build we use but I'll gladly try again.