Gyrebage collection

We can't undo what's been done. So we learn and move on. In a best case scenario, we can find ways to turn negatives into positives.
As a species we are creating an enormous amount of un-recycled waste and too much of that amount is winding up swirling around in Gyres in our oceans. There are clean up efforts being made but the main problem seems to be photodegredation of the plastic into polymer chains, small enough to be mistaken for phytoplankton, called neustonic plastic.
This then enters the food chain and wreaks all kinds of havoc.
As far as I know there are no methods available to address this aspect of the problem.
Now, this might not work so if someone would be kind enough to tell me why not I'll be able to get over it already and daydream about other stuff that might work.

Since the plastic breaks down into neutrally buoyant bits I think it might be possible to suspend sound emitters beneath the Gyres which would collect particulates into self organizing patterns using the principle of Cymatics to create standing wave forms in the water.
Since Seawater contains ferrous metals, when enough of these particles are concentrated into suspended strands they should be able to conduct an electric current.
If this spherical cage shape were electrified via solar, wind, or wave energy from the surface, then these suspended strands will begin to transform into Seacrete which would become too dense to stay in the upper water column and instead become floating reefs until growing dense enough to sink to the sea floor and become real reefs trapping the plastic within them.

So...would it work?