So sorry to hear this. I wish him a fast recovery.

You could pull this off with rofi or wofi(if you’re on Wayland). I don’t know if a theme like this exists already(it should), but if it doesn’t you could just make your own. As for the icons, I think the easiest option would be making an icon theme. If you want to call the menu by pressing the Win key, there’s probably already a built in option for that if you’re on a desktop environment. If you’re not, there are additional programs such as sxhkd you’ll need.