In Ce-based heavy fermion materials, there is competition between the interactions which lead to a magnetically ordered arrangement of the Ce magnetic moments, and the hybridization between the local moments and conduction electrons, which quenches the local moments. Sometimes the magnetic transition can be tuned to zero temperature at a quantum critical point (QCP), where unusual properties arise due to quantum fluctuations. CeRh6Ge4 orders magnetically at a low temperature of 2.5 K, but by swapping Si for Ge, the magnetism is suppressed and eventually disappears, likely at a QCP. We propose to measure doped and undoped samples using inelastic neutron scattering, so as to characterize the nature of the magnetic ground state and crystal field excitations. This allows for the role of hybridization to be understood, and for the unusual spin fluctuations near a QCP to be probed.