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.
ctrl v is convention for paste, but plenty of things (ex terminals) use that for something else. this is a universal (wrt the app receiving it) keycode that means paste. it lets you bind a key, or a keyboard shortcut, to the paste key and paste in any app. without this it isn’t possible.
it doesn’t even have to be a new programmable keyboard. there exist software key remappers for linux.
you could remap a mouse button to paste, you could remap ctrl v to always paste regardless of the app, etc., all in software, all not possible before.