How about we set a maximum wage instead of a minimum wage? But it's not a set number. It is a maximum multiple of the lowest paid employee at a company? 10x should do it. If the CEO wants a million each year then the lowest paid employee still gets 100k. I'm trying to think of why this wouldn't work.
Probably won't work because the ultra-wealthy don't get ultra-wealthy by earning wages.
The only reason it doesn't is the greed of folks who become billionaires.