You can do the 4 fans in all those builds, you just need to move the mouse quickly from corner to corner and quit at the right time.
Picking up orbs will sometime lock the game at 0.2 fps, but IMO it depends on where the camera is looking. I did Eventide and it locked while putting the last orb in place, the one in the small island, still managed to fit it and had to wait like 5 minutes until I could save and reload.
I can confirm you can 100% the game on CEMU (even those koroks you have to climb to the top of the flag and it locks, sometimes it won't, lol).
What's the orb next to Vah Ruta that gives you problems?
Rucco Maag but I already did it on my WiiU
Just approaching the area the shrine was at would crash cemu.