Crowd Simulation using Niagara and Metahumans

Has anyone tried this? Is it possible or are Metahumans too performance heavy? I need to make a cinematic of a crowd simulation in Ue5, pedestrians walking in busy City centre. I would like to use Metahumans but if too performance heavy I was thinking using either Anima XYZ software or iClone characters made in CC3. Does anyone have any other solutions that could give the best photorealistic results. Thanks