Chinese Bianzhong bells could also be a source of inspiration.
From Wikipedia: "They have a lens-shaped (rather than circular) section, the bell mouth has a distinctive "cutaway" profile, and the outer surfaces of the large bells feature 36 studs or bosses, symmetrically placed around the body in four groups of nine. This special shape gives zhong bells the remarkable ability to produce two different musical tones, depending on where they are struck."
If they can be made at the nanoscale, a single stack could maybe achieve results comparable to two "singing bell" stacks.

The ancient Chinese water bowls do the same, yes?

I can't say the 'singing bowl' idea will or won't work, but it seems to me that resonance isn't really the goal. Absorption is. There may be other approaches to improving absorption that are simpler to use in manufacturing and achieve equal or better efficiencies, such as ring-shaped molecules tuned to the desired light frequencies, which also can be layered.

Standard Optical Resonator Array, old tech repurposed with a religious story, how quaint.

I'm not a Buddhist or religionist in any way, but even I know this crap -
Buddha was not a god, he was simply the delivery guy of an instruction manual for the human psyche.
The only thing that makes people call Buddhism a religion is the fear of realization that the only real "god" is your own mind.