I was looking for something similar, but for tmux. I wanted to be able to search visible words in the current tmux pane, then copy that word to the system clipboard by pressing the associated label key.
I built https://github.com/Kristijan/flash-copy.tmux, with the aim to bring that functionality to tmux.
Here’s a bit of a write up https://blog.kristijan.org/posts/TMUX-Flash-Copy for those interested. I welcome any feedback.