We are planning on making this modification to the 2 desks in my sewing space too. And, I was getting ready to ask this same question. Interesting feedback.
Question. Some of the smallish sewing tables for sale that have cut outs, but no electric or air lifts, have a system that uses a hinged platform with some type of adjuster thing (my friends has a chain). Can you buy these hinged platform contraptions? Cause that would be a really simple solution. But, I have not seen them for sale anywhere.
One of my desks has a keyboard 'drawer'; but, it won't support a machine.