There are a couple of people here who have already gone down the same road as you and may possibly have bought more displays than they really needed, but if not, one dodge which you can use is to harvest the display from a contemporary basic calculator, which you can find in the usual places.
I have found that the 'Texet 880', sold in large numbers by Woolworths etc in the late seventies, has exactly the right sort of display - I have actually had a Texet 880 display connected to my original MK14 so I can say for sure that it definitely works.
I believe Tim has mentioned the exact switches which fit the JM PCB, as he had some initial difficulty locating them as well.
Edit: Yes, back in post #148 of this thread, Tim mentioned the switches...
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...they are Multimec 3FTL6 or H9 as that is not documented elsewhere - they are hidden under the red keycap and the reproduction keypad housing.
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