setkbmap us -option ctrlL:swapcaps -option compose:rwin
You can place that command at XFCE's startup settings for applications.
My `stty intr ^X` disagrees
I've made Ctrl-C do copy paste in the terminal, even in vim, with a special function for wayland:
vnoremap <C-C> <CMD>call WLCopy()<CR>
setkbmap us -option ctrlL:swapcaps -option compose:rwin
You can place that command at XFCE's startup settings for applications.