Below is another type of foot that I found on Amazon.com.
It wasn't exactly what I was looking for, but I thought the idea of having extensions that can be collapsed, under the foot, could allow for a larger "foot print". I know that I am not explaining myself very clearly, bit having additional layers that can be rotated out would prevent it from interfering when it is in the "up" position, and optional layers that can be used only when you need them.
I think what you have done so far is classy. It has that quality look like the rest of your products.