I use Diodon. I’ve set it up so that copy is CTRL+C, Paste is still CTRL+V, but what I call “Super Paste” is SUPER+V, showing a list of the last 20 items that were copied, including images.
Great utility, especially paired with FlameShot.
The only thing is that the Super Paste always pastes unformatted. Not a big deal, but something to consider.
I’ve been using Flameshot, and it’s been awesome for just this. Tons of annotations, and very easy to copy or save screenshots.