  Designing devices composed of many small resonators is a challenging problem
that can easily incur significant computational cost. Can asymptotic techniques
be used to overcome this often limiting factor? Integral methods and asymptotic
techniques have been used to derive concise characterisations for scattering by
resonators, but can these be generalised to systems of many dispersive
resonators whose material parameters have highly non-linear frequency
dependence? In this paper, we study halide perovskite resonators as a
demonstrative example. We extend previous work to show how a finite number of
coupled resonators can be modelled concisely in the limit of small radius. We
also show how these results can be used as the basis for an inverse design
strategy, to design resonator systems that resonate at specific frequencies.
