If your husband could put a piece of trim about 1/4" below the surface of the table then you could get a piece of 1/4" acryllic/plastic cut to fit the opening with space for your machine.
We have a great plastics company down here. They have cut various items for me. One was a piece for a smaller extension table for my DSM. I made my pattern with double thick freezer paper and gave it to the plastics people.
You can PM me if you like.