Mob transporter

I’ve had an idea for a while but have only now found out how to post it. What I want is a way to transport mobs from place to place that you can direct more accurately than with mine carts and boats. This will make starting a village or gathering passive mobs from further away much easier and plausible. To accomplish this my two ideas are either a baby carrier you can wear in place of a chest piece, this will allow you to carry mobs but only babies, as well as only passive mobs for instance putting a baby zombie in the satchel will make you take damage from that mob. The second idea is a wagon you can attach to a horse or donkey, it’s mechanics will work a lot like a boat, whereas you will have to push mobs into the wagon, or another player can enter as you can with a boat or mine cart. Overall this will make transport much easier and give the players creative freedom to find creative ways to use said items.