Making this kind of beast will take years of planning and expertise. I might take a crack at it since I'll be actually in China next year and own a beamspring.
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Do the world a favor and invent a low profile capacitive switch with the same key travel and feel of the classic beamsprings. Then we can put it into all the different layouts that people like today (I'm only interested in TKL myself).
I have this figured out. Just cut a keyboard sized hole in your desk and sink the the beamspring into it with some straps to give you the feel of low profile. If your keyboard is high profile, raise the profile of the desk around it.

There is no reason you couldn't make a low profile beamspring style keyswitch. But consider that just changing the case on a model f. Just the case from one of the plastic ones on the F AT to the 107 with its heavy metal case, makes the keyboard sound totally different. Okay, maybe coke vs pepsi different.
Once you make such drastic changes to the height, the material weight etc. It wont feel the same at all.