Surface Pro 2 and Cubase 7

I believe it should work since the Surface Pro runs Windows proper.
You will have to buy it and install it first. Or, try a USB hub and use the full Cubase (just to see how it does). Then, if it works very well and you really don’t want to bother with the dongle, you could buy Elements for the tablet. If you do, please report back how it works out (particularly performance wise). There are several people here wondering about a “Cubase on a tablet” solution.
HTH
J.L.