DTX Multi12 + kick controller/pad + hat controller. Add optional snare etc. (pic is not mine!)
All ekits on racks / stands are as big or small as you want to make them, by playing around with tube sizes etc. There's no limits on size. I had one setup I used to use with everything on a single Premier Trilok tom stand.
I'm sure you can re-config your TD-9 to be smaller in many ways
The smallest footprint e-kit in the world is my custom one - mounted on a single mic stand - eleven playing surfaces plus two pedals! Commercially, though, it has to be the NUX DM-1 - find it on YouTube.