I do remember when ctrl+shift+insert was common for paste (rather than ctrl+v). I can't remember off hand was copy was beyond it being a similar key combination. Still trips me up these days using cmd instead of ctrl on macs.

ctrl+insert for copy and shift+insert for paste are still a thing in the majority of places in Windows, though I think only the ancients like me use them (people newer to the game being taught ctrl+C & ctrl+V from the start).

Not long ago I even spotted it being usable in an app that blocked ctrl+C/ctrl+V.