Missing my arm rest. Retrofit ideas pls

Just got a new eco flex vivaro,lovely to drive but really miss the armrest. Iv had a poke through the trim to see if there is a fastner there to retro fit one but there feels like it's got nothing to fix into.so if that's the case I'm thinking maybe buy an armrest and adapt/make a bracket to bolt on to the bulk head that slots in between driver & passenger seat which I can just pull up/down
Has anyone done this, ifso from what make and model of motor worked best for you