No. The reason this can't work is that "trashing" an orbit works by a long chain of random collisions which also put debris into different orbits at roughly the

No. The reason this can't work is that "trashing" an orbit works by a long chain of random collisions which also put debris into different orbits at roughly the same altitude. The debris from a smashed StarLink for example goes into a thousand different orbits with a variety of different directions but all at a similar altitude to the StarLink and so they'll collide with other StarLinks and similar LEO birds. For LEO that works, so many of these orbits are also occupied, the cascade happens - but for GEO all of the similar orbits are empty except the one everybody uses. Orbiting Earth in exactly 24 hours but say North-South, or at 14° is fun but pointless, all of the GEO birds are in the exact same orbits because they're "hovering" over a specific point on the equator by travelling at the same speed at which that point rotates, that's the whole reason to be at that expensive altitude. So your trash almost invariably goes somewhere empty and makes little difference to anything.