Would it be possible, perhaps, to take a rubber dome keyboard that has MX compatible stems (Gateway Anykey, Tandon Me 101) or other switches with MX compatible stems (where the slider is held by the switch TOP, like Futaba Clicky or Maxi) and make a new top plate from them to press the Topre domes?
Most likely cheaper than 3D printing.
Or we can wait for the Coolermaster Novatouch to come out and harvest the sliders from that.