I haven't gone thru every single point he's made, but I have both Word and Boxer Text Editor customized to use WordStar (or similar) keyboard commands across the board. Plus I have VBA macros to do more complicated things assigned to other keyboard shortcuts in Word.
And I use a simple utility to swap the Control, Alt, and Capslock keys to put them back where they belong system wide.
I don't even like reaching for the backspace key. That's what Ctrl-h is, and always has been, for. AutoHotkey does that system-wide.
I'd be surprised if all of WordStar's functionality couldn't be duplicated in addition to having the power that the newer programs offer.
(also use most of the same keyboard shortcuts in Excel, but you have to use VBA onkey to assign keys to other than Ctrl-letters, and AutoHotkey for shortcuts while editing cells since macros don't work then).