Just thinking that doing step two that early will lose a lot of hop aroma as air and co2 is pushed out, right? Especially in those first few days of vigorous fermentation.
If you're going to go with the magnet method, would it be better to secure the hops after those first few days, but also while co2 is still being produced before fermentation ends? Then when you're ready, theoretically the O2 from the hops would be pushed out from those remaining days of fermentation, you can drop the hops in. I imagine you'll still lose some aroma from the remaining fermentation, which would have started to slow down, but maybe not as much as you would for the entirety of fermentation.