If your really looking for harp switch stands you won't find any that are better than the ones by Allan at Grants Pass & Pacific.
Some cleaning and assembly is required but he supplies all parts necessary including the drill bit.
You are aware that a harp stand is reverse signaling to most type stands, therefore requires a reverse throw rod action. No big deal, and Allan
supplies full instructions for the installation of the reverse rod. This is a prototypical situation used by many small backwoods/shortline railroads.
Your right nothing looks better than a harp, but on the ground installation does make them very vulnerable as has been stated.