how to get modern aero track wheels with low spoke count in silver?
It can't be done because nobody would even try to make the rim shapes you need for truly aero wheels in metal, because they would be worse in every measure than carbon ones. If you want "aero" wheels, you could build silver 24h H+Son Formation Face onto your choice of silver small flange hubs (Phil, Novatec, Royce etc.) with silver CX-Rays and they would probably test faster than Ellipses.
It can't be done because nobody would even try to make the rim shapes you need for truly aero wheels in metal, because they would be worse in every measure than carbon ones. If you want "aero" wheels, you could build silver 24h H+Son Formation Face onto your choice of silver small flange hubs (Phil, Novatec, Royce etc.) with silver CX-Rays and they would probably test faster than Ellipses.