Just saw this on TMO during a Uni break. There is this thing called Project N955. The aim of the project is to turn an N9 into an N950. It isn’t the most elegant, or perfect solution, but it works.
HtheB posted his process as follows;
I bought a cheap iPhone bluetooth slide-case, and a cheap N9 case on eBay.
I unscrewed the case to get rid of the iPhone case, to just have the bluetooth keyboard with the slider.
Then, I just made holes in the cheap N9-case and screwed the slider on it.
Turn on the device, pair them and the result: N9 with a keyboard!
So essentially, all this “mod” is, is swapping out the iPhone case on a BT keyboard, for the N9 case. There are still drawbacks, like being able to hide the VKBD while using the BT keyboard, but that is being worked on. There have been posts in the past (don’t remember where I saw them), where the community was trying to get these keyboards made specifically for the N9. At the moment, this is the best solution.
He has posted several photos as well as a video. Take a look below.