You can't do it instantly, Realm has a cool down for switching items. Just record your mouse movements with Ghost Mouse, and set the speed to like 5x.
I tried, not fast enough. I need it to be nearly instant. There has to be a way to do it because i know people do it lol... go look on the duping tutorial thread. There is talk about duping UTs by waiting for oryx shake, connect to vault, drop off items, recon to realm, crash, profit. Only problem here is the time to drop off items. Any help or tips would be greatly appreciated...
If you ever noticed... If you try to spam a hotkey to switch items, sometimes they will switch back or flicker.