I have found a pretty good solution after all, I think. 
Clipboard Manager TEST Macros.kmmacros (9.3 KB)
Macro A: Opens the Clipboard Manager (⌃+v) and/or allows navigation with the same shortcut.
Macro B and C: Are self-explanatory
Macro D: Enter. If the Clipboard Manager is open, Enter pastes the selected clipboard and closes the Clipboard Manager. If not, it is simply Enter.
