On Linux, Control-C and Control-V don't work for copying and pasting in terminals. The Control modifier is used for its original purpose of inserting control codes. Instead, terminal apps require an extra Shift modifier, like Control+Shift+C.
But what if there were hidden shortcut combos for copy and paste
Buying a new keyboard with an unusual key (combination) is not the solution to a universal copy paste shortcut. I didn’t get why you’d write about adding a new universal shortcut by buying a new external keyboard that you can customize when you can customize what you already have. Yes, customizing the external keyboard is different but it is far far away from becoming universal.