Motorised Tu-95 Bear

So over Xmas 2019 I managed to get my two "grail kits"; the Amodel IL-76 and the Trumpeter Tu-95MS. I want to add contra-rotating props to the Trumpeter 1/72 kit. I found other others have motorised the props one way but getting true contra-rotation is more elusive. My original idea was to use two motors behind one another, one with a hollow shaft, but then I considered a toy RC helicopter. They use two pager motors side-by-side each driving a gear. One gear is connected to a shaft that runs up through another gear driven by the other motor. The problem was these are quite big, but then I came across these nano-rc helicopters...