Numerous theoretical and experimental works have explored the effects of collectivity on linear spectroscopy . However, many of these works have assumed that the collective nature of the spectral signatures requires a large number of molecules N, such as those analytical works relying on thermodynamic limits of linear response equations, single-particle Green's functions, and molecular susceptibilities, etc . Therefore, it is widely assumed that the collective nature of these hybrid systems is not directly reachable with standard "brute force"-style diagonalization techniques.