For the list of all clipboard items, ready to be chosen: Klipper tray icon, right-click → Configure clipboard → Shortcuts→ “Open Klipper at Mouse Position”. You can choose from the list either with the up/down keys, or with the mouse.
Klipper’s item-cycling doesn’t require more keystrokes than Emac’s. For example, what I achieve in Emacs with C-y M-y M-y I achieve with Klipper with H-v H-v C-v (no need to operate with the mouse). H is the “hyper” or “super” key – but the keys are fully customizable.