I don’t think I’m going to be able to buy this, tried numerous searches. it comes very close to what I have been looking for, for many years.
Atari 400 membrane keyboard
Here it is suggested by a user on my last post.
I made a previous post about keyless flat keyboards
Settled for the 'purekeys compact keyboard' which is allegedly worth $199 but I got it for £30. It is very nice, but not my ideal.
I confirmed it's genuine by sending pictures to the manufacturer.
Criteria
No glass keyboards unless they are rectangular.
Completely flat keys, no raised bumps.
Preferable completely stiff/hard keys, although not so important.
I already have the purekeys medical keyboard so don't need any advise on that.
No laser keyboard unless there is a way to project the laser on a rectangular piece of glass or rectangular glass which just has key letters as light/leds.
Notes
This is a very pleasant community, glad to be here.