In my target, with the new system, the cashiers cannot access the button to load the RC. The workaround that they use, is that they swipe some gum or something handy, which "opens up" the register, and from there they can load the RC (probably Dan taught them that!).
Would K8 K8 work without this gum trick?
ETA:
answer from the FT Wiki
1) The cashier presses the Extras/K8 option on their screen and then presses K8 again. If they don’t see Extras or K8 on their screen (it depends on their login rights), they can scan an item for purchase and K8 will come up. Whether you purchase that item or the cashier voids it, K8 remains on the screen for them to press and continue with loading Redbird.