I use a map; work out a half mile from the threshold and mark it or look for something nearby to reference. I do this with the alternates too.
Things like roundabouts, adjacent junctions, rivers, edges of towns etc. all work fine.
The problem with using the runway perspective is that all runways have a different one (Human performance and limitations books cover this quite well). And airspeed, I'm a bit confused as to how you could use this as a marker for distance?