Greetings.
As of now, the answer would be no. The Framework laptop’s keyboard has a height of 3.8 mm, from the top of the key cap to the bottom of the back light circuit.
The ultra-low profile Cherry MX switch is 3.5 mm tall. Assuming a 0.3 mm key cap is even possible, the keyboard will still require to have a PCB to form the keyboard matrix. All this would bring it very close to, or even exceed 5 mm height, which would be past the limit of the current chassis.
Might be possible in a bigger model though.
On a side note, while I daily drive mechanical keyboard, the FW’s current keyboard feels quite good to use.