I thought I would try a couple of carry alternatives for the Sidewinder.
I bought a Sticky Holster and it fit the pistol very well. I had it in my right front pocket. I had to put my left hand on the outside of the pocket when I withdrew the Sidewinder in order to hold the holster in the pocket.
I put on the Holster Grip and found that the pistol does not fit into the Sticky Holster.
So the choice seems to be either the Sticky Holster with the Standard Grips, or the Holster Grip without being able to cover the hammer.