You should take a look at arcan, it's almost exactly that: http://arcan-fe.com

- https://arcan-fe.com/2022/10/15/whipping-up-a-new-shell-lash...

- https://arcan-fe.com/2024/09/16/a-spreadsheet-and-a-debugger...

I am not using it as a daily driver, because, emacs, but I keep an eye on it because, well, emacs.