I'm going to go test Spirit GS's and see if I can find any faster ways to get them all.
I found a really fast, consistent setup for the TSC+cucco into BotW, so I always enter that way. If you stand against the crate by the graveyard with the entrance to your right, L-target, get to the very right edge of the crate, you can shield drop the cucco and climb onto the crate it'll always go to a place where it's easy to reach. From there, with Gyro on, align your vision so that the bottom arrow for the motion icon rests in a little dark V in the wall, and you'll have the perfect angle. Backflip twice, TSC, grab the cucco and you're through.
I heard (but haven't tested) that chus dupe the same way as nuts, so you could get all the Poes in two trips if you used both of them. You can change them back to normal in the Spirit Trial.
When fighting Iron Knuckles, due to link's new backflip animation you can't repeatedly backflip/jumpslash to dodge their attacks and kill them, and crouch stabs are slow because they don't store your last attack anymore. However, if you stand back and throw bombs at the Iron Knuckles, that kills them very safely and quite fast too. Chus are better, but they may be in short supply depending on where you pick them up.