Welcome from Michigan! :)

Welcome from Central Florida. I recently made a similar quilt for my daughter, and I don't think you need a stitch regulator for this quilt as you do one flap or petal at a time, and you can control the speed with your foot control since you aren't doing free quilting but stitching a curve around the flap.

true. When attaching this type of quilt to the backing the way I did it is having to only sew down the flaps along the horizontal. That intels a S type of motion along the full length of the quilt. Too this is only one type, I have other ideas for similar quilts. I would think, to my way of thinking, it would be so much simpler to have a speed controlled my motion of the machine rather than the foot. Who knows later I may want to do a little " fancy " work inside each square.
Denim against the skin ,to me, is cold and that why I add the batten and muslin on the underside.

Welcome from Round Rock, Texas!