I work in "tech" and I'm substantially net short "tech" as a hedge for potential layoffs, via options. Unfortunately I can't hedge via my employer's stock directly (like most companies my employer very explicitly disallows it, plus I'd be running a high risk of an insider trade accusation; I think it's understandable and acceptable).
A better idea might be to force people's allocation way ahead of time, say any change must be pre-announced 6-12 months ahead of time. That's how responsible executives (for example Bill Gates) sell their stock - via long term stock sale programs. Once signed - has to happen, whether good news or bad news.