Used to have that actually, it's just too much of a hassle in today's cloud environment (I can easily SSH into dozens of fresh instances over a day and there's no way I'm baking my personal config into an image). I was considering to revisit and streamline that, but I imagine the cognitive overhead of different remote hosts having different configs is worse than what I have now (local=my config, remote=vanilla).

I just bind a different prefix and moved the bar to the top locally (I use urxvt+tmux with Ctrl+arrow keys etc to navigate tmux tabs instead of a tabbed terminal client) to get around the nesting issue.