I love the term "cuddle puddle"! But my chicks start roosting the same night they move into the coop. I place them on the perch squished as close together as I can get them with the most timid chick against the wall and the boldest chick on the outside of the lineup. I place a hand lightly on their backs, pressing slightly on their heads, and this calms them and makes them sleepy. Once settled on the perch, I shut off the light. Within three nights, they are hopping onto the perch on their own.
People think chicks can't learn to roost until they're much older, but they just need to be taught. When I have had a broody hen raise chicks, she teaches them to roost beside her. I've never had chicks "puddle cuddle" because they've roosted right off. This has been the case for the entire fifteen years I've kept chickens.