Devo 6s Question

Sorry if this is in the wrong place or has been discussed before I looked and didn't see anything. I'm fixing to order a new radio in the next week and I like the idea of the compact devo 6s but also like the devo 8s due to the 2 extra channels. Since the 6s & 8s share the same display and probably the same software or close to the same. I was wondering if it was possible to add the extra two switches to the 6s