Paul, yes it can be done but at a price (£300+) I would advise looking for a longer type 2 first if that suits before splashing out on an extension.
I just bought a 10m replacement
p.s leaving the forum. Going back to my CX5 until Mazda gives us a proper four door EV. Transporting more sprogs and adults and back seat access is becoming too much of an issue.
All the best going forward
Alan