Yes see, that's specious reasoning. The 512Ke as far as I know NEVER shipped with a Plus keyboard. As far as the 512K/800 goes, that seems to be the only difference.
What really confused me was this, I'm not sure what it means since the Mac Plus had 800K drives well after Superdrives were introduced:
What I was really asking was what is the difference between the 512K/800 and 512Ke, so sorry for the confusion.
One thing that I will now speculate on is the fact I have never seen a picture of a Macintosh ED without a full keyboard. While the keyboard could have gotten there at any time during the intervening 20 years, given that it is the same model number as the 512K/800 (M0001D) which also has a full keyboard, I am going to suggest that was the standard configuration for the ED models as well, including the the 512K M0001ED model, which I suspect followed the discontinuation of the 512Ke. The rational being that schools would have more need for a keypad than the average household, just as businesses would. But of course that is all specious reasoning as well.
Here's one more thought ... outside of the UK, it makes sense to call an "Enhanced" 512K something else since "enhanced" would not always translate to the letter "e", but a number like 800 would mean something. Were there otherwise in fact 512Kes in Europe and Asia?