[Closed] Bike seats for a commute bike / touring bike

I'm currently taking our little one to nursery in an ergobaby on the back on my way to work. We're moving so will have slightly further to go and I'm interested in swapping this for a seat over the back that I might be able to quickly remove for the majority of my commute.

A MacRide or WeeRide would be fine ona  MTB or something with an upright position but I'm not so sure it'll work on the commuter.

We have a chariot which is great fun but quite a bit of faff to take apart and store at nursery then reassemble for the ride home.

So what options or advice does the STW massive have? Oh and if anyone is offering to flog their stuff, we're in Newcastle...