Technology

It would be easier to have a satellite in orbit that fires a shotgun at them.

You would need some fancy orbital calculations and precise aiming to make sure the shotgun pellets actually intercept the mirrors, and it would take some engineering to make a shotgun that fires the pellets in a narrow enough cone at high enough velocity to be able to get on an intercept course with most satellites, but you could probably fit it on a Starlink-sized payload. The main issue would be bribing a launch provider to send it up there, but once it's there you could direct it from the ground without it being traceable to you, and you could have it thrust randomly to dodge anti-satellite weaponry until it runs out of shells.

At some point this would create enough space debris that it could trigger Kessler syndrome, with the debris from destroyed satellites hitting other satellites faster than it de-orbits, until all satellites in low earth orbit are reduced to powder that falls down to earth over a couple of years.

Apart from bribing a launch provider to get the satellite up there, you could probably do either of these for under $10 million, most of it R&D. Much cheaper than developing your own surface-to-space missiles.