A really simple connection that is as slop free as anything is a rod in a tube. That can be a Sullivan goldenrod or a 2-56 metal rod running through a thin tube all the way back. If the airfield is fairly rough I'll suggest doing a separate connection to the tailwheel not so much out of fear of breaking it but because the strain can wallow out the hole in the rudder you use for control giving you a sloppy tailwheel. You know about moving the mains forward so the wheels are under the leading edge of the wing in a taildragger conversion right?