I have a 27 month old who mainy loves to walk but still needs the pushchair when tired. I'm due our second in feb and suddenly realised do I need a double pushchair? I have a joie chrome dlx that I used with my DS and was hoping to use it again but is it realistic to get my older one to walk all the time? Will a buggy board fit that pram? Not sure if its worth buying a whole other pushchair...