I’m a long time lurker and haven’t posted here before. If I understand what you are looking for, then Maybe....
Maybe the solution is a different needle? You could get that hand-stitched look with the right needle tip.
As an example, I’ve attached a technical marketing bulletin from Groz-Beckert, a needle manufacturer. Perhaps a different needle would get your intended result. I have no idea if these are available to fit any particular machine. I enjoy the technical aspect of sewing and leather craft, maybe more than the creation part of it. Or maybe I’m just stupid. Hope this helps.
Randy in Tulsa
EDIT: Going through this thread again, now I’m not sure this is what you are asking. Back under my rock.