Mast base organizer?
Re deck trackage. Would tweekers (Downhauls floating on the jib sheets to judiciously positioned deck blocks) answer your need? If the eye pads were ''inboard'' and ''outboard'' (inhaul & outhaul) you can trick the jib clew into thinking its fairlead was any place within a rectangle on deck. The higher the clew the longer the fore and aft dimmension of the rectangle. However, a fixed fairlead further aft would be required to provide a fair lead to the winch. It''s an economical and convienent way to position the jib clew for sail shaping.