I've noticed some of the newer machines don't use a spring action quilting foot but rather one that floats across the quilt. You could try using your regular foot and adjust the presser foot pressure so the quilt sandwich can be moved freely. Years ago my aunt did free motion embroidery on a treadle machine and no foot. It sounded kind of scary to me.
Alternatively, one of the generic feet might work. I've bought walking and free motion feet for my featherweight and 15-91 clone. You just need to know if your machine is low shank or high shank.