Hi I have 2 year old twins and a 9 month old baby. We currently have a I candy twin buggy and I carry the baby on a baby strap. My partner wants to bring them out a walk while I'm at work but don't want to spend on a compact triple stroller. Does anyone know of anything that can be attached to the buggy with a seat and harness to put one of the 2yr olds in? We have a buggy board but it's not safe near roads as the 2yr old needs to be strapped in.