For what it's worth, you can just do this using Alt (i.e. 'meta'). No special terminal required. Just use `bind -n M-<X>` to say 'no prefix' and use meta-<X>.

For example, `bind -n M-1 select-window -t 1` means Alt-1 goes to Window 1 for me.

I use Alt-h, Alt-j, Alt-k, Alt-l for vim-aware pane switching (with some vim config too), e.g. via `bind -n 'M-h' if-shell "$is_vim" 'send-keys M-h' 'select-pane -L'`. I have a load of Alt-<X> mappings.

I use iTerm and Windows Terminal primarily, but it works on everything, really. Though sometimes you need to adjust what 'alt' means; in iTerm, you need to make Alt be Esc+ (I think).