wireframe itself has nothing to do with the geometry, that's just how the polygons are displayed, thus is independent of CGA.
creating polygons for each edge (to colorize them) is not a RAM issue, it's a polycount-issue, since you increase the amout of geometry massively. E.g. this kills the performance in a WebScene ..
But this would be the only way to drive this in CGA .. It depends on the use case of course ..
M.